Cafe, Paris, 2009
You're in a gallery — maybe mine — and you find a photograph you love. As a collector, provenance matters. Turn the print over and you should find the artist's signature, an edition number, and a Certificate of Authenticity. Provenance is simply the documented ownership history of that print, and a credible paper trail is what lets you buy with confidence.
Photography is different from most collectible art. A painting is one object. A photograph starts as a negative or a file that can be printed endlessly. Provenance is what ties the print in front of you to a specific, authorized edition — proof it isn't just one of an uncounted many.
Before you buy, get answers to a few things. When was the photograph created, and when was it printed? What documents come with it — original invoice, exhibition records, artist's notes, if any? If you're buying secondhand rather than from the artist or gallery, that paper trail is also what proves the print hasn't been separated from its edition somewhere along the way.
Once you buy, keep that material together in a safe place. Skip it, and the print gets harder to resell, insure, or appraise at full value later. You'll need the documentation the day you sell or pass the print on — not the day after.