How to compare condition reports from online art sellers—and why matte versus glossy finishes matter in a family home

Standardised terminology: what a credible report includes

A condition report is not a marketing description. It is a forensic account of an object’s physical state, using terms defined by institutions. The Fine Art Trade Guild’s Framing Standards mandate disclosure of: medium (e.g., "12-colour pigment ink on 310 gsm cotton-rag"), support (paper type, canvas weave), dimensions (unframed: 50x70 cm / 19.7x27.6 in; framed: 62x82 cm), surface irregularities (e.g., "2 mm abrasion at lower-right corner, visible under raking light"), and colour permanence ratings (ISO Blue Wool Scale 7–8 for archival pigments). Omissions here signal either neglect or concealment.

For prints, the report must specify ink type. Pigment inks (e.g., Epson UltraChrome) bond to the substrate and resist UV degradation for 80–100 years under glass; dye inks fade within 20–30 years even in indirect light. The International Fine Print Dealers Association notes that glossy finishes amplify surface flaws—micro-scratches in resin-coated papers (260–300 gsm) become visible at acute angles, whereas matte cotton-rag (310 gsm) diffuses light, obscuring minor imperfections but muting colour saturation by 12–15%.

Price differentials: framed versus unframed at standard sizes

Framing accounts for 40–60% of the total cost at premium levels. For a 50x70 cm (19.7x27.6 in) print:

• Unframed, unfixed: $120–$280 (pigment on 310 gsm cotton-rag, deckled edges, signed in pencil).
• Framed, conservation-grade: $450–$900 (acid-free 4-ply mat, 99% UV-filtering glazing, solid wood or aluminium profile, hanging hardware).
• Framed, museum-grade: $1,200–$2,400 (rag mat with 8-ply depth, optically coated acrylic glazing, hand-finished frame with archival mounting).

The disparity reflects labour: hand-cut mats, precision joinery, and UV testing add 15–20 hours to production. Sellers omitting framing costs upfront often use pre-assembled units with MDF backs and standard glass (50% UV protection), which yellows within 5–7 years.

Surface examination: how lighting exposes flaws

Condition reports must document inspection under three light sources: ambient (500–700 lux), raking (30° angle to detect texture distortions), and UV (365 nm to reveal prior repairs or ink inconsistencies). Glossy finishes—common in Giorgio de Chirico reproductions—show "bronzing" (metallic sheen) when viewed off-axis, a defect irreversible once printed. Matte surfaces, preferred for Gerhard Richter’s blurred photorealist works, conceal fingerprints but attract dust, requiring annual cleaning with a microfiber cloth (never compressed air, which embeds particles).

The Metropolitan Museum of Art’s Glossary of Art Terms distinguishes between "surface soiling" (removable) and "media transfer" (permanent, e.g., ink offset from stacking). Reports lacking UV photographs of the verso (reverse side) risk omitting foxing or mould spores, which migrate through unsealed paper fibres over time.

Provenance and edition details: red flags

A report for a Lawren Harris or Richter print must cite the edition number (e.g., "12/50"), printer (e.g., "Steidl, Göttingen"), and publication year. "Open edition" implies no scarcity; "AP" (Artist’s Proof) should not exceed 10% of the main edition. Beware sellers conflating "limited edition" with "numbered"—the latter merely indicates sequence, not exclusivity. For secondary-market works, request a chain of ownership; gaps longer than 5 years without documentation suggest potential forgery.

Price manipulation often targets transitional-period works. Harris’s shift from representational (e.g., Houses, Winter, City, 1919) to abstract (e.g., North Shore, Lake Superior, 1926) saw his 1923–25 pieces—neither fully realistic nor purely abstract—undervalued by 30–40% until the 2010s. Richter’s 1960s photo-paintings (Ema (Nude on a Staircase), 1966) now command 2–3x the price of his 1980s squeegee abstractions due to their hybrid technique. Condition reports for such works must include high-resolution detail shots of brushwork or ink layering to verify authenticity.

Framing specifications: what reports omit

Even comprehensive reports often neglect framing materials, which directly impact longevity. A 50x70 cm print framed with:

• Standard glass: 50% UV block, 2–3 mm thick, reflects 8–10% of light (visible glare at 45°).
• Conservation glazing: 99% UV block, 2.5 mm acrylic or laminated glass, <1% reflection (e.g., Tru Vue Optium).
• Spacer width: 3–5 mm for prints on paper; 8–12 mm for canvas to prevent condensation.

Acid-free mats should extend 5–7 cm beyond the print on all sides (adhering to the "two-thirds rule" for visual balance when hung ~145 cm from floor to centre). Reports describing frames as "archival" without specifying pH-neutral adhesives or aluminium barrier boards are insufficient. For family homes, avoid deep rebates (>2 cm); they trap dust and require professional cleaning every 3–5 years.