Find out who speaks for the artist
An estate, a committee, a foundation — or nobody. Where an authority exists the market will want its opinion and accept little else. Where none exists, catalogue matching and provenance do that work instead.
Who is allowed to speak for each artist, what the catalogues record, and what a loupe settles before either of them is needed.
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Art does not authenticate like a handbag. There is no stitch to read and no serial to look up. There is a named authority — an estate, a committee, a foundation — whose opinion the market accepts, and a catalogue raisonné recording what the artist actually made. Everything else is evidence in support of an argument those two eventually settle.
So the first fact about any artist is who speaks for them, and it is frequently nobody. Warhol's authentication board dissolved in 2012 and Lichtenstein's foundation stopped issuing opinions; Banksy's Pest Control is the only gate his market accepts; Chagall's committee still functions. Those differences change the entire approach, and a generic guide obscures them.
Before any of it, one check settles most cases for free: a loupe. It separates a print from a reproduction in seconds, and a very large share of what arrives here as a possible original turns out to be a poster — which is nobody's fault, and much better to know early.
The order matters more than the list. Two checks settle most cases, and they are almost never the ones people reach for first.
An estate, a committee, a foundation — or nobody. Where an authority exists the market will want its opinion and accept little else. Where none exists, catalogue matching and provenance do that work instead.
Edition size, medium, publisher, printer, paper and dimensions are all recorded. A discrepancy in any of them is where a case begins to fail, and edition size is the commonest failure by a wide margin.
A regular dot grid means photomechanical reproduction. Flat opaque ink, ink relief or a plate mark means printmaking. The exception is Lichtenstein, whose dots are the artwork — which is exactly why knowing the artist comes first.
On most artists a pencil signature applied to the paper's surface is strong evidence. On Dalí it is close to neutral, because the artist signed blank sheets in enormous quantity. The same mark means different things on different names.
One page each, in the artist's own terms — its code system, its weighted checks, its models and what they do on the secondary market.
Lovenhall ArtThe checks tell you how it was made. The instrument tells you what it appears to be, and roughly what its kind fetches.