{"tema_id":"2674","string":"ambrotype (wet collodion process)","created":"2021-01-07 17:28:18","code":null,"notes":[{"@type":"Nota de escopo","@lang":"en-US","@value":"A variant of the wet collodion process to produce a direct-positive camera original. The collodion is coated on glass, the image underexposed and then underdeveloped, the glass backed with black lacquer or black cloth, and the whole mounted in a case or frame. Occasionally, the image was made on ruby glass.\nSource: Art & Architecture Thesaurus\nhttp:\/\/vocab.getty.edu\/page\/aat\/300137324 "}]}