{"id":"S2004014549","label":"Neutral density filters","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh2004014549","normalized_label":"neutral density filters","broader":["http://id.loc.gov/authorities/subjects/sh85076893"],"aliases":["Attenuance filters","Attenuators (Optics)","Filters, Neutral density","Gray filters","Neutral filters"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh2004014549","provider":"lcsh","revision":"7f32580639023a78","taxonomy_revision":"f050b5d4780b1289","title":"Neutral density filters","url":"/topics/S2004014549","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"5478708412819056198","address_version":"morton4x16-v1","coordinates":[0,477,52055,21504],"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}