Start With the Paper and the Inks

The fastest test is the cheapest to run. Ask the seller two questions. What is the paper weight, and are the inks pigment or dye. A serious art print answers both without hesitation. Archival cotton or alpha-cellulose paper runs 250 to 350 gsm. Poster stock runs 130 to 200 gsm and curls easily. Pigment inks hold colour for decades. Dye inks fade within a few years, especially the blues and greens that dominate Duncan's palette.

If a listing cannot state these basics, treat the silence as the answer. This matters more for Duncan than for many painters. His work leans on cool blues, pale flesh tones and fine decorative line, the exact things cheap printing flattens first. A reproduction on poster stock will look acceptable for a week and worse every month after. The comparison is not subtle once the two sit side by side.

Read the Listing Like a Skeptic

Suspicion of online claims is justified. The phrase archival carries no legal meaning and appears on listings for £20 posters. So does giclée, which describes a printing process, not a standard of result. What separates a credible seller from a generic one is specificity. Look for a named paper brand or at least a weight, a stated printing method, a declared edition size or open-edition status, and dimensions that match the image rather than pad it with border.

A second signal is how the seller handles questions. Reputable print studios answer paper and ink queries in a sentence, because the answers flatter them. Vague replies about high quality standards are a pattern worth walking away from. Also check the image itself. A good reproduction is made from a high-resolution photograph of the original or a faithful scan, and the listing will say so. Blurry source files produce prints where Duncan's fine outlines go soft at the edges.

What It Should Cost, and What Provenance Adds

Price tracks the materials. Expect £15 to £40 for a poster-stock reproduction, £80 to £250 for a large archival print, and more once framing enters. A price far below the materials cost is itself information. Nobody prints 350 gsm cotton paper with pigment inks to sell at £18 with free shipping. The maths does not close, so the materials are not there.

One honest boundary. A reproduction, however good, is a reproduction. Provenance in the strict sense belongs to originals and to the small market of Duncan's signed lifetime prints, which is a different world with different verification. What a quality reproduction can carry is documentation of its own making, the paper, the inks, the edition. That is the standard worth holding a seller to, and it is one a buyer can actually check.