1. A method for dating photographic prints comprising: a) scanning a front side of a photographic print forming an image scan; b) scanning a back side of the photographic print forming a back scan; c) defining a database of photographic print watermarks, each photographic print watermark comprising a representation of a watermark pattern and an associated date range; d) analyzing the back scan using a cross-correlation process between the back scan and the watermark patterns in the database of photographic print watermarks to identify a matching photographic print watermark; e) determining a date range for the image scan responsive to the identified matching photographic print watermark; and f) associating the determined date range with the image scan.