The conservation of photographic materials is emerging as a field of specialization. While addressing areas of concern common to the preservation of most types of cultural property-such as environmental criteria for storage and display, examination and identification, emergency procedures, fumigation, and the development of apprenticeship programs -- the conservation of processed photographic materials also requires separate methods and specialized care. This paper reviews restoration treatments applicable to photographs and describes experiments on the restoration of discolored black-and-white photographs in chemical solutions. Test procedures are outlined that allow a fair assessment whether a given photograph will survive such treatments. See also AATA 15-1751.