CAS 148-25-4 appears in our catalog under these names: 1,8-Dihydroxynaphthylene-3,6-disulfonic, acid, 100 g, Chromotropic acid, 1,8-Dihydroxynaphthylene-3,6-disulfonic acid, 4,5-Dihydroxynaphthalene-2,7-disulfonic acid 96% (sodium salt xhydrate), 1,8-Dihydroxynaphthylene-3,6-disulfonic, acid, 50 g. Offered by: Roth, GLPBio, Biosynth, Ambeed, Fluorochem. Available pack sizes: 100g, 500g, 50g, 250g, 25g, 5g.