{"id":"S85101181","label":"Photographic chemistry","description":"Here are entered works on chemical processes employed in photography. Works on the chemical action and influence of light are entered under the heading [Photochemistry.]","source_url":"https://id.loc.gov/authorities/subjects/sh85101181","normalized_label":"photographic chemistry","broader":["http://id.loc.gov/authorities/subjects/sh85022986"],"aliases":["Chemistry, Photographic"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85101181","provider":"lcsh","revision":"2497fd214590f62b","taxonomy_revision":"f050b5d4780b1289","title":"Photographic chemistry","url":"/topics/S85101181","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"10126423201862009348","address_version":"morton4x16-v1","coordinates":[0,20,18985,62464],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}