4-[(2,4-dihydroxyphenyl)azo]benzenesulphonic acid

C.I. Acid Orange 6 (Free Acid) is a byproduct in the synthesis of Acid Orange 24 (A189835), which is used in trickling biofilters for wastewater treatment. Acid Orange 24 is used in suncare compositions. It also serves as a raw material for cosmetics. Mutagenicity test for dye compositions in cosmetics.

ChEBI: 4-[(2,4-Dihydroxyphenyl)azo]benzenesulfonic acid is a member of azobenzenes.