Photographers' Formulary Benzotriazole (Anti-Fog #1) - 1 Lb. Tweet Description Benzotriazole is used as an organic antifoggant and density depressant in developers. Details Additional Category Tags: Chemistry, Alternative Process & Miscellaneous Chemistry Category: Photography Manufacturer Catalog Number: 10-0250 1LB Product Manufacturer: Photographers' Formulary Subcategory: Darkroom Equipment