Collector Authentication Guides

Every authentic KAWS figure carries a stamped mark on the bottom of one or both feet. On genuine pieces this stamp is crisp, evenly inked, and consistent in font weight. On fakes the stamp is often blurry, uneven, or slightly wrong in font — the spacing between characters is off, or the ink bleeds into the vinyl.

Check the stamp under good lighting and magnification. On OriginalFake Medicom releases (2006–2013) the stamp reads "OriginalFake" with the Medicom copyright line below. Any deviation in font, spacing, or ink quality is a red flag. The 2006 Five Years Later Companion in Blush/Red, for example, has a very specific stamp that fakes consistently get wrong.

KAWS's XX eyes are the most recognizable element of his figures — and the hardest for counterfeiters to replicate perfectly. On authentic pieces the X elements are symmetrical, cleanly recessed into the head, and cast with consistent depth. The crosshatch lines are sharp-edged, not rounded or mushy.

On fakes the eyes are frequently too shallow, asymmetrical, or have slightly rounded rather than sharp cross intersections. Hold the figure at eye level and look straight on — any tilt or asymmetry between the two XX eyes is a strong indicator of a counterfeit. The Companion's hands and feet also have specific proportions that fakes routinely distort: fingers are too thick, too thin, or unevenly spaced.

Authentic KAWS figures use a high-quality soft vinyl with a specific weight and matte-to-satin finish depending on the edition. Fakes almost universally use cheaper vinyl that is either too light, too rigid, or has a noticeably different surface texture — often slightly tacky or with a plasticky sheen that real pieces don't have.

Pick up the figure. A real Companion has heft. A fake often feels hollow or lightweight even when it isn't. The paint application on authentic pieces is clean and even — especially on the XX eye detail and any secondary color accents. Fakes show paint bleed, uneven coverage, or slightly wrong color matching.

KAWS releases have very specific packaging for each edition and year. The box graphics, font, colorway, and material quality are all era-specific. A 2006 OriginalFake box has specific printing characteristics, a particular matte finish on the exterior, and specific interior tissue or foam that changed over editions.

Counterfeiters frequently get the box wrong even when the figure itself is passable. Look for: correct Pantone color matching on the box exterior, correct font weight on edition text, proper silver or foil stamp placement, and the right interior packaging. If the box smells strongly of chemicals or the printing looks slightly pixelated or off-register, it's almost certainly fake.

2006 Five Years Later Companion (Blush/Red, OriginalFake Medicom): The blush colorway has a very specific peachy-pink tone that fakes consistently render too orange or too pale. The red accent placement on the ears and belly is precise — any slop or edge bleed is wrong. Foot stamp reads "OriginalFake ©2006 MEDICOM TOY."

KAWS BFF: The ears have a specific curvature and the stitching seam on plush versions follows a precise path. Vinyl BFF versions have tightly controlled paint edges on the XX details.

COMPANION (Open/Closed): The articulation points on authentic open-edition Companions have clean joint seams. Fakes often show mold lines, flash, or slight misalignment at the shoulder and hip joints.

Authentic Shepard Fairey prints are produced on specific paper stocks — typically cream or off-white heavy stock for letterpress editions, or a distinct cream-toned newsprint-weight stock for poster editions. The paper has a specific feel: slightly textured, with a weight that's immediately apparent when you hold it.

Digital reproductions are almost always printed on bright white paper stock that looks visually wrong next to authentic pieces. The surface texture is too smooth, the white too clean. Authentic Fairey posters have a warmth to the paper base that digital prints on modern stock can't replicate.

Fairey's screen prints are produced with precise ink layering — typically two to four colors laid down in sequence. On authentic prints you can see the ink sitting slightly proud of the paper surface, especially on thicker areas of coverage. Hold the print at a raking angle to light: authentic screen prints show ink texture and slight physical dimension.

Digital reproductions are flat. The ink has no physical presence above the paper surface. Additionally, authentic screen prints show intentional registration marks or slight ink overlap at color boundaries that are characteristic of the medium — fakes are digitally perfect in a way that real screen prints aren't.

Authentic Fairey editions are hand-numbered and signed in pencil. The pencil marks have a specific quality — slightly waxy, applied with consistent pressure. The numbering format is consistent: "XX/XXX" with his signature immediately below or to the right.

Fakes frequently use pen instead of pencil, or reproduce the signature photographically. A printed signature looks perfect and consistent — a real signature has natural variation in pressure and stroke. Under magnification, a genuine pencil signature shows graphite grain; a printed reproduction shows halftone dots or inkjet pixel structure.

18×24 poster editions: Standard Fairey poster size. Authentic pieces have specific color palettes per edition — the Obey Giant red is a very specific Pantone that fakes frequently shift slightly toward orange or toward crimson.

Letterpress 10×13 editions: Printed on a letterpress, these have deep ink impression into the paper that creates a tactile quality impossible to fake digitally. Run your finger across an authentic letterpress print and you feel the impression. A digital reproduction is completely flat.

Signed vs unsigned editions: Some editions were released both signed and unsigned. An unsigned edition with a signature added later is one of the most common frauds in this category.

Death NYC prints (typically 13×18" or matted in 16×20" and 18×24") are heavily counterfeited. Authentic Death NYC pieces have specific paper stock, consistent ink saturation, and precise edition stamps on the reverse.

The reverse of authentic Death NYC prints carries a consistent stamp format with edition number, year, and artist mark. Fakes frequently omit or incorrectly reproduce this stamp. The image edges on authentic prints are clean and deliberate — Death NYC's pop-culture mashup compositions have precise color fields that digital reproductions often render with slightly wrong color profiles.

The single most important thing to know: most forgers use the wrong pen. Authentic sports signatures are typically signed in Sharpie (for jerseys, helmets, photos) or ballpoint pen (for cards, flat items). The ink behavior on fabric vs paper is very specific.

On a jersey, Sharpie ink soaks into the fabric fibers and bleeds very slightly at the edges — this is correct and expected. Forged signatures on jerseys often show either too-perfect edges (applied with a fine marker over fabric stiffener) or wrong ink behavior entirely. On authentic signed balls, the Sharpie sits slightly raised on the leather panels and follows the natural texture of the surface.

Every athlete has specific signing habits that forgers frequently get wrong:

NFL: Players typically sign across the front panel of helmets, centered on their number on jerseys. Quarterbacks usually sign the right chest; skill players vary by era and team.

NBA: Signed balls are typically signed on the "sweet spot" — the flat panel between two seams. Team-signed balls follow a specific arrangement by position and seniority.

MLB: Signed baseballs have very specific sweet spot conventions. Hall of Famers typically sign larger and more deliberately than active players. The "sweet spot" is the clean panel between two seams directly opposite the manufacturer's stamp.

A paper COA is worth exactly as much as the paper it's printed on. Any forger can produce a COA — and most do. The presence of a COA from an unknown or newly created authentication company is actually a red flag, not a green light.

Legitimate authentication companies (PSA, JSA, Beckett) use tamper-evident holographic stickers with specific serial numbers that can be verified against online databases. A sticker that looks slightly wrong in color, font, or holographic pattern is almost certainly counterfeit. Blockchain-anchored COAs like TrueCOA's are immutable — the record can be verified by anyone on a public ledger regardless of what the paper says.

The most reliable authentication method is comparing the signature against a verified exemplar from the same era. Signatures change significantly over time — a Michael Jordan signature from 1986 looks very different from one signed in 2015. Comparing a 1992 signature against a 2010 exemplar and calling them inconsistent is an authentication error.

Key comparison points: baseline angle (does the signature sit on an imaginary line consistently?), letter formation on key characters (especially initial capitals), pen pressure (consistent across the piece?), speed indicators (hesitation marks, line tremor, pen lifts in wrong places all indicate forgery).

Immediate red flags: - Signature that looks "too perfect" — natural signatures have variation; machine-perfect is wrong - Ink color that doesn't match the era or medium (wrong Sharpie color for the period) - COA from a company that didn't exist when the item was allegedly signed - Seller cannot provide acquisition provenance - Price significantly below market (authentic Jordan, LeBron, or Brady signed items have floor values) - Photograph of signing that shows wrong venue, wrong jersey era, or wrong pen - Sticker placement that covers part of the signature (authentic authentication stickers are placed to not obscure the signature)

Guitar finish type fundamentally changes how signatures age and look. Vintage guitars (pre-1970s) typically have nitrocellulose lacquer finishes that are porous and age distinctively — signatures on nitro finishes sink slightly into the surface over decades and develop a specific patina. Modern guitars have polyurethane or polyester finishes that are non-porous: signatures sit entirely on top.

A signature that appears to have "sunk in" on a modern poly finish is a red flag — this effect is sometimes artificially created with heat or chemical treatment. Conversely, a signature on a vintage instrument that shows no aging while the finish around it shows heavy checking and wear is suspicious.

The most common forgery error on guitars is pen selection. Pre-1980s signatures were typically made with felt-tip markers or ballpoint pens — both age in specific ways on lacquer. Sharpie wasn't widely available until the mid-1980s; a pre-1985 signature in what appears to be a modern Sharpie is immediately suspicious.

Authentic aged ink on guitar finishes shows specific UV degradation — black Sharpie fades toward brown-gray; silver markers lose metallic sheen; ballpoint ink can crater or lift if the finish wasn't fully cured when signed. Forged signatures frequently use fresh ink that's then artificially aged with UV lamps — this creates wrong color degradation patterns.

Jimi Hendrix: Signed almost exclusively in ballpoint. His signature is compact, with a distinctive "J" loop and connected "Hendrix" that forgers routinely render too large or too loose. Extremely rare on instruments — most Hendrix-signed guitars are forgeries.

Elvis Presley: Signed in ballpoint with consistent pressure. The "E" has a specific flourish; "Presley" is usually written quickly with connected letters. Presley items are among the most forged in the entire memorabilia market.

Kurt Cobain: Signed in Sharpie with an erratic baseline — authentic Cobain signatures show deliberate variation, not random sloppiness. The "K" is distinctive. Extremely high forgery rate due to demand and relative scarcity of authenticated examples.

Where on the guitar the signature appears matters. Artists sign in specific locations by convention and practicality. Headstock signatures are rarer and more valuable — they're also harder to forge because the surface is smaller and curved.

Body signatures on acoustic guitars are typically on the lower bout. Electric guitar signatures are usually on the upper body near the neck pocket or on the pickguard. A signature in an unusual location (e.g., on the back of the neck, on the nut) should raise questions about authenticity and whether the item was actually signed in a normal signing context.

A signed guitar without a clear chain of custody — who owned it, where and when it was signed, how it passed through hands — is always suspect. The highest-confidence signed guitars come with:

Photographic evidence of the signing event (backstage photo, concert program from the same night, setlist), original purchase receipt from a legitimate dealer who was present at the signing, and consistent provenance documentation from every owner.

Any gap in that chain requires additional technical authentication. A guitar that "came from an estate sale" or "was my uncle's" with no documentation is a starting point, not a conclusion.

Neil Armstrong's signature is the single most counterfeited autograph in the space memorabilia category, and arguably in all of American historical memorabilia. His reluctance to sign after the early 1990s created artificial scarcity that drove prices high — and forgeries higher.

What authentic Armstrong looks like: Armstrong's signature evolved significantly across his lifetime. 1960s NASA-era signatures are more open and flowing, with a pronounced "N" and a connected "Armstrong" that shows speed. By the 1980s–2000s his signature became more compressed and deliberate — the letters are smaller, tighter, and the "A" in Armstrong is more angular.

Key forgery tells: Forgers typically work from a single exemplar period and apply it to items from the wrong era. A 1969 photograph with a 1990s-style signature is wrong. Armstrong also specifically stopped signing certain item types — mass-produced lithographs, commercial products, and items that seemed purely commercial. Authentic signed items from his later years are almost exclusively mission-specific photographs, books, or items with clear personal significance.

The "secretarial" signature problem: Armstrong employed a secretarial signature — signed by staff on his behalf for fan mail through the 1970s. Secretarial signatures are worth a fraction of authentic examples but are frequently sold as authentic. They're slightly more flowing and less deliberate than Armstrong's own hand.

Unlike Armstrong, Buzz Aldrin has been a prolific signer throughout his life — which creates both more authentic material in the market and more sophisticated forgeries, because forgers have abundant exemplars to work from.

What authentic Aldrin looks like: Aldrin's signature has remained relatively consistent across decades, though it has compressed and simplified with age. The "B" in Buzz has a specific double-loop formation; "Aldrin" is typically signed quickly with an upward final stroke. He frequently adds "Buzz" above or alongside his full signature on high-value items.

Items Aldrin is known to sign: Mission photographs (especially the iconic visor reflection image), NASA lithographs, books, and personal items at signing events. He participates in organized signing events, meaning there is a substantial volume of legitimate authenticated material available — which also means the forgery volume is correspondingly high.

Authentication anchor: Aldrin-signed items from organized events (celebrity signings, comic cons, space conferences) have the strongest authentication chain because witnesses were present. Items without event provenance require technical analysis.

Michael Collins orbited the Moon while Armstrong and Aldrin landed — and his signature is both rarer and less frequently forged than his crewmates', making it in some ways more reliable as an authentication anchor on crew-signed pieces.

What authentic Collins looks like: Collins's signature is distinctive and consistent — a flowing "M" with a high initial stroke, connected to "Collins" with a specific downward-then-upward baseline. The "C" in Collins has a specific open curvature. His signature is generally larger and more open than Armstrong's later signatures.

The crew-signed item problem: Apollo 11 items signed by all three crewmembers — Armstrong, Aldrin, and Collins — are among the most valuable in the category and correspondingly heavily forged. On authentic crew-signed pieces, each signature shows individual variation in pressure and pen angle. Forgers working from static exemplars produce signatures with unnaturally uniform pen pressure across all three names.

Collins after Armstrong's death (2012): After Armstrong's death, any item presented as freshly crew-signed is impossible to authenticate as genuine. Items claimed to be post-2012 crew-signed should be rejected immediately.

NASA Lithographs: The NASA lithograph program produced official mission photography that was widely signed. Authentic NASA lithographs have specific paper stock, print quality, and NASA marking. The most commonly forged is the Buzz Aldrin visor reflection photograph — it exists in enormous quantities, both authentic and forged.

First Day Covers (FDCs): Philatelic covers postmarked on the day of the Apollo 11 launch or splashdown, signed by the crew, are among the most documented category. Authentic FDCs have specific postmarks (Kennedy Space Center, July 16 1969 for launch; USS Hornet cancel for splashdown) and period-correct ink on the signatures. The paper and envelope stock are specific to the era.

Mission Patches: Embroidered mission patches signed by crew members are frequently forged. Authentic patches from the era have specific thread count, embroidery style, and backing material. A 1969-era patch with a 2000s-style Armstrong signature is wrong on its face.

Photographs: The most important authentication factor for signed photographs is era-correct paper. A photograph printed in 2005 but represented as signed in 1970 will show wrong paper stock under analysis. Authentic period photos have specific silver gelatin or chromogenic print characteristics that differ from modern reprints.

For any Apollo 11 item at significant value, technical authentication is non-negotiable:

Ink dating: Modern forensic ink analysis can establish when ink was applied to a surface within a range of years. This is the definitive test for items claimed to be signed in the 1960s–70s. An ink dating result inconsistent with the claimed signing date ends the authentication.

Paper/substrate analysis: The material the signature is on must be consistent with the claimed period. Paper fiber composition, coating characteristics, and aging patterns are all datable.

UV fluorescence: Authentic period ink has specific UV fluorescence characteristics that differ from modern inks. A signature that fluoresces wrongly for its claimed period is a forgery.

Exemplar comparison: Compare against the specific signing period, not just any exemplar. Armstrong in 1969 vs Armstrong in 2005 are nearly different signatures. Use era-matched comparisons from verified authenticated examples, not internet images (which may themselves be forgeries used as reference material by other forgers).

Authentic BE@RBRICK figures from Medicom are produced with tight mold tolerances — seam lines where the body halves join are clean, consistent, and minimally visible. On fakes the seam lines are often more pronounced, slightly misaligned, or show flash (thin excess plastic along the seam edge).

Run your finger along the seam of the figure. A real BE@RBRICK has an almost imperceptible join. A fake frequently shows a ridge or stepped edge where the molds didn't align perfectly. On 1000% figures this is especially detectable around the head join and the torso split.

Every authentic BE@RBRICK has a stamp on the bottom of one foot. The stamp format is consistent: "BE@RBRICK" in a specific font, the © Medicom Toy mark, and a date code indicating production year. The font weight, character spacing, and stamp depth are consistent across authentic pieces.

Fakes frequently have stamps that are too shallow (wrong impression depth), wrong in font weight (too thin or too thick), or missing the date code entirely. On artist collaboration pieces (KAWS x BE@RBRICK, Banksy x BE@RBRICK), the collab credit appears in specific text on the stamp — any deviation in this credit text is a red flag.

Artist collaboration BE@RBRICKs have paint applications that are approved and quality-controlled by both Medicom and the collaborating artist. The paint is applied cleanly with consistent coverage, sharp edges on graphic elements, and accurate color matching to the official edition.

KAWS x BE@RBRICK pieces have specific XX eye placements with the precise geometry that KAWS mandates. Banksy collaboration pieces have specific stencil-quality graphic applications. Any paint bleed, edge softness, or color profile deviation from the known authentic edition is a forgery indicator.

The 100% companion figures are more commonly faked than 400% or 1000% because the smaller scale makes detailed inspection harder — but the same quality markers apply.

Authentic BE@RBRICK boxes have specific printing characteristics: correct Pantone color matching on the box background, specific foil or UV spot treatment on edition text, correct font on all text elements, and proper paper weight for the box stock.

The inner packaging is also specific: authentic figures are held in a specific plastic tray or tissue wrap depending on the edition. Fakes frequently use wrong inner packaging — either the wrong tray shape or wrong material entirely.

On limited edition artist collaboration boxes, the edition number is typically printed (not stickered) on the box. A stickered edition number on a box that should have printed text is wrong.

Authentic BE@RBRICK figures use specific ABS plastic with a consistent weight and surface texture. The surface is smooth with a satin finish on most editions, matte on specific colorways, and glossy on others — always as specified for the edition.

Fakes are almost universally lighter than authentic pieces — the plastic is thinner or lower density. Pick up a known authentic piece and a suspect piece and compare directly. The weight difference is frequently immediately perceptible. The surface texture on fakes is often slightly wrong — too glossy when it should be satin, or slightly rough when it should be perfectly smooth.

In 2011, the Andy Warhol Art Authentication Board — the only body that had formally authenticated Warhol works — disbanded after years of litigation stemming from their authentication decisions. They issued a formal statement that they would no longer authenticate any works. This created a complete authentication vacuum that has not been filled.

What this means practically: there is no official Warhol authentication. Any entity claiming to offer "official" Warhol authentication is misrepresenting itself. Authentication of Warhol works now relies entirely on: provenance research (documented ownership chain), catalogue raisonné cross-referencing (the Warhol Foundation publishes records of known works), technical forensic analysis, and stylistic expert opinion — none of which produces a definitive answer alone.

The Simon Wiesenthal Center estimated that up to 80% of works attributed to Warhol in lower-tier sales may be misattributed or outright forgeries. This is not a market with marginal fraud — it is a market with structural fraud built into its foundation.

Warhol's major screenprint editions — Marilyn Monroe, Mao, Flowers, Campbell's Soup, Electric Chair — are among the most extensively documented works in modern art. Each edition has a known size, paper specifications, ink colors, and distribution history.

Authentication focus points: Paper stock — authentic Warhol screenprints use specific Lenox Museum Board or equivalent. The paper weight, texture, and acid content age in specific ways. Ink application — Warhol's screenprints show specific squeegee direction and ink thickness patterns. Registration — slight but consistent mis-registration between color layers is characteristic of authentic prints; digitally perfect registration suggests reproduction. Publisher's stamp — most editions carry a specific stamp on the verso from the publisher (Factory Additions, Castelli Graphics, etc.) that has specific typeface and ink characteristics.

Warhol produced an enormous volume of drawings across his career — shoe illustrations, celebrity portraits, abstract works — and this category has the highest forgery concentration because the technical barriers are lower than screenprints.

Authentic Warhol drawings show: Consistent hand characteristics — his line quality, pressure patterns, and compositional habits are well-documented across thousands of verified works. Period-correct materials — ink, pencil, and paper types consistent with the claimed creation date. Blotted line technique — Warhol's distinctive early blotted line drawings have specific transfer characteristics that are difficult to fake convincingly.

The verso of drawings is frequently more diagnostic than the front: authentic pieces carry specific notations, stamps, or handling marks that forgeries miss.

The Andy Warhol Foundation maintains a catalogue raisonné — a comprehensive scholarly record of known authentic works. This is the single most important reference for any Warhol authentication question.

If a work does not appear in the catalogue raisonné, it doesn't mean it's fake — Warhol was extraordinarily prolific and the catalogue is ongoing — but absence of record combined with other authentication gaps is a serious red flag.

Cross-reference any potential purchase against the catalogue raisonné before proceeding. The Foundation can be contacted about specific works for research purposes even though they no longer issue authentication opinions.

For any Warhol work at significant value, technical analysis is mandatory:

Ink dating: Modern forensic ink analysis can establish the approximate age of ink on paper. An ink dating result inconsistent with the claimed creation period ends the authentication. Canvas analysis: For paintings, canvas weave, ground preparation, and aging characteristics must match the claimed period. UV fluorescence: Authentic period materials have specific UV responses. Modern reproductions fluoresce differently. Pigment analysis: XRF (X-ray fluorescence) can identify specific pigment compounds and match them against known period-correct materials.

No single technical test is definitive. Authentication of high-value Warhol works requires a convergence of multiple lines of evidence pointing to the same conclusion.

Pest Control is Banksy's handling studio and the only entity authorized to issue Certificates of Authenticity for his work. Critically, Pest Control COAs are issued for original works at the point of sale from Banksy's studio — they do not authenticate works for third-party sellers after the fact.

A Pest Control COA means the work passed through Banksy's official channels at some point. It does not mean a work being sold without one is fake — many legitimate Banksy works predate the COA system — but it does mean that any work without one requires substantially more scrutiny.

Pest Control COAs have specific characteristics: shredded-Banksy-note design, specific paper stock, reference numbers that can be looked up. These COAs are also counterfeited. Verify any claimed Pest Control COA directly with Pest Control before purchasing.

Banksy's screenprint editions — produced through Pictures on Walls, Laz, and other documented publishers — are the best-documented category of his output. Each edition has a known size, colorway variants, paper specifications, and distribution record.

Authentication markers: Printer's blind stamp — authentic editions carry specific blind stamps from the printing studio. Paper — Banksy's print editions use specific paper stocks (Somerset Velvet, Arches 88) with consistent characteristics. Ink application — stencil-quality crisp edges on interior elements, with specific overspray and ink thickness patterns. Edition documentation — documented editions have known total numbers; any edition number outside the documented range is impossible.

Banksy's original street works — murals, stenciled pieces on walls — are the highest-value and most complex category. Works removed from walls have specific extraction characteristics and documentation requirements.

What legitimate wall extraction looks like: professional architectural extraction leaves specific patterns of wall substrate attached to the reverse. The work's location is documented photographically before removal. Chain of custody is maintained through a recognized art handler. These factors are all verifiable and forgeable.

Photographic provenance — photos of the piece in situ on its original wall — is the strongest single piece of evidence for street work authenticity. The location, surrounding context, and documentation must be consistent with known Banksy activity in that area and period.

Banksy fakes fall into three categories: Outright forgeries — works created to look like Banksy originals with no connection to him. Misattributed works — street art in a similar style falsely attributed to Banksy. Reproduction fakes — high-quality giclée reproductions of known Banksy works sold as original screenprints.

Reproduction fakes are the most common in the online market. They look visually convincing in photographs but fail on paper and ink examination. Signs: ink sits flat on paper surface without the slight physical presence of screenprint ink; paper is too white or too smooth for the claimed edition; no blind stamp or incorrect blind stamp characteristics.

For high-value Banksy works: Stencil consistency — Banksy's stencil work has specific spatial relationships between positive and negative space that are consistent across authenticated works. Paint analysis — for canvas and wall works, paint type (aerosol vs brush applied) and layer sequencing should be consistent with the claimed medium. Substrate aging — canvas, paper, and wall substrates age in specific ways; accelerated aging is detectable under forensic analysis. UV examination — under UV light, authentic screenprint inks from documented editions have specific fluorescence profiles that differ from gicleé reproductions.

Keith Haring died in February 1990 from AIDS-related complications. Every Haring work is now historical — there are no new authentic Haring works being created. The Keith Haring Foundation manages his estate, maintains his archive, and promotes his legacy, but does not operate a formal authentication board.

Authentication relies on: Provenance research — documented ownership history back to before 1990. Catalogue raisonné cross-referencing — the Foundation maintains records of known works. Technical forensic analysis — period-correct materials, aging characteristics. Stylistic expert opinion — Haring's vocabulary of figures, symbols, and compositional patterns is well-documented.

The absence of a formal authentication body means expert opinions vary and no single authority provides definitive answers. Convergent evidence from multiple independent experts is the closest approximation to certainty.

Haring signed his work in several ways depending on the context and period: his name in full, his initials KH, and sometimes a small radiant baby figure as his mark. His signature evolved across his career but maintained consistent characteristics.

Early work (1978–1982): Subway chalk drawings are rarely signed. When signed, the signature is quick and informal. Mid-career (1983–1987): More deliberate signatures, often accompanied by a date. Late work (1988–1990): Signatures can show slight motor irregularity consistent with illness — this is authentic and documented, but forgers have used this as cover for sloppy forgeries.

Key forgery tells: Haring's signature has specific letterform proportions — the "K" and "H" and "a" have consistent geometric relationships. The pen lift between letters occurs in specific places. Forgers working from photographs frequently get the proportions wrong.

Haring worked across an enormous range of media: subway chalk, ink on paper, acrylic on canvas, vinyl tarps, ceramics, and commercial merchandise. Each medium has specific authentication markers.

Chalk subway drawings: Executed on black paper advertising panels in the NYC subway system. Authentic pieces have specific paper stock from the Transit Authority's advertising contractors and show specific chalk application characteristics. Most authentic subway drawings are in institutional collections. Acrylic on canvas: Period-correct canvas preparation, paint brands, and aging characteristics. Works on paper: Specific paper stocks, ink types (Sumi ink is common), and aging patterns consistent with the claimed period.

Haring's Pop Shop sold official merchandise — posters, T-shirts, buttons — from 1986 until after his death. Signed Pop Shop items exist but require provenance documentation connecting them to a specific signing event.

Pop Shop items are not automatically valuable simply by being official merchandise. A signed Pop Shop poster is valuable; an unsigned one is not. The forgery risk in this category is: adding signatures to legitimate unsigned Pop Shop merchandise to create a "signed original."

Authentic signed Pop Shop items typically have provenance connecting them to a specific event, charity auction, or documented signing — not just a claim that it was purchased at the store.

For any significant Haring work: Ink analysis — Haring's specific ink preferences (Sumi, Speedball) have identifiable chemical signatures. Period-correct ink should be present. Acrylic analysis — specific paint brands available before 1990 have compound profiles that can be verified. Paper and canvas aging — natural aging of substrate materials follows specific patterns that are difficult to fake convincingly over long periods. UV and infrared examination — reveals underdrawing, pentimenti, and restoration work that can indicate altered or fabricated works.

Basquiat died in August 1988 at age 27. The Jean-Michel Basquiat Authentication Committee, established to provide some order to the market, disbanded in 2012 after years of legal disputes over authentication decisions — most notably a series of lawsuits from collectors whose works were denied authentication.

The disbandment created a complete authentication vacuum in what had already become one of the most valuable and most forged sectors of the contemporary art market. A 2022 FBI investigation uncovered a forgery ring that had placed Basquiat fakes into major museums and auction houses — a finding that demonstrated the sophistication of the forgery problem.

The practical reality: No body exists to provide definitive Basquiat authentication. Any claim of "official" authentication is false. Expert opinion, technical forensic analysis, and provenance research are the only tools available — and none is individually definitive.

Basquiat's visual vocabulary — crowns, skulls, SAMO© tags, anatomical diagrams, text and numbers, copyright symbols, crossed-out words — is extensively documented and extensively forged. The elements themselves are not authentication markers; their specific deployment and interaction is.

What authentic Basquiat looks like at the compositional level: specific spatial relationships between text and image, consistent pressure and application patterns within a single work, the integration of mark-making across multiple layers that reflects his actual working process (building up, crossing out, repainting). Forgers typically work from photographs of finished works and miss the process evidence that shows through in X-ray and infrared examination.

The crown motif specifically is so heavily forged that its presence on an unverified work is almost a red flag rather than a positive indicator.

Basquiat worked across an enormous range of supports: canvas, wooden doors, refrigerator panels, found objects, paper — in many different media: acrylic, oil stick, spray paint, xerographic toner, house paint. Each medium and support combination has specific forensic characteristics.

Spray paint: Basquiat used period-specific spray paint brands (Krylon, Red Devil) whose chemical profiles are identifiable and period-datable. Modern aerosol formulations differ chemically from 1980s versions. Oil stick: Specific brands (Markal, Shiva) have compound profiles that are period-specific. Acrylic: 1980s acrylic formulations differ from modern formulations in specific ways that are analytically identifiable. Found objects: The aging of the underlying object (a door, a cabinet panel) must be consistent with the claimed period.

More than almost any other artist, Basquiat authentication rises and falls on provenance. Given the absence of a formal authentication body, the documented ownership history of a work is the primary authentication anchor.

What strong Basquiat provenance looks like: gallery records from a recognized downtown New York gallery operating in the 1980s (Annina Nosei, Larry Gagosian, Fun Gallery, Mary Boone), documented sale records, exhibition catalogues with the specific work illustrated, insurance records from the claimed period of ownership.

The gap between 1988 (Basquiat's death) and the present must be bridged with continuous, verifiable documentation. Any gap in the chain — particularly "private collection, no records" — requires additional forensic evidence to compensate. A work that surfaces with no auction record, no exhibition history, and no gallery documentation should be treated as a forgery until proven otherwise.

For any Basquiat work of significant value, a full technical examination is mandatory:

Infrared reflectography: Reveals underdrawing and working process. Authentic Basquiat works show specific process evidence under IR that differs from works created to look like finished Basquiats. X-ray examination: Reveals compositional changes, overpainting, and material layering consistent with authentic working methods. Paint cross-section analysis: Microscopic examination of paint layers establishes the stratigraphy of a work and must be consistent with the claimed chronology. Pigment analysis (XRF): Identifies specific pigment compounds and matches them against period-correct materials. Dendrochronology for wood supports: Wood used as a support can sometimes be dated by ring analysis.

No single test is definitive. Basquiat authentication at high values requires a convergence of technical evidence, provenance research, and stylistic analysis by multiple independent experts.