Despite their relatively brief history, photographs have become a ubiquitous property for both Fine Art and Antiques and Residential Contents appraisals, and increasingly appraisers are required to identify and distinguish between the different types and processes of photographs. What's the difference between a daguerrotype and ambrotype? Salt print and platinum print? Silver collodion and silver gelatin? Carte de viste and cabinet card? And most importantly, what impact does it all have on value?