disodium 4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate

Chocolate Brown HT (CAS# 4553-89-3) is a synthetic organic food colourant, and a long-term carcinogen.

4-Hydroxynaphthalene-1-sulfonic acid (2 Moore) diazo, and 4-(Hydroxymethyl)benzene-1,3-diol?coupled.

Non flammable

red light brown. Soluble in water for brown. The strong sulfuric acid for red purple, diluted chocolate brown for red precipitate to brown precipitation and the solution. Its water solution and strong hydrochloric acid for dark chocolate brown precipitation and the solution; Add sodium hydroxide solution for product red.