{"id":"S91002497","label":"Photochromic polymers","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh91002497","normalized_label":"photochromic polymers","broader":["http://id.loc.gov/authorities/subjects/sh85101148","http://id.loc.gov/authorities/subjects/sh90000921"],"aliases":[],"source_identifier":"http://id.loc.gov/authorities/subjects/sh91002497","provider":"lcsh","revision":"620d1d57a91c59eb","taxonomy_revision":"f050b5d4780b1289","title":"Photochromic polymers","url":"/topics/S91002497","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"4630835387882160706","address_version":"morton4x16-v1","coordinates":[0,21,45658,1024],"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}