Direct Brown 44:1

4-Aminonaphthalene-1-sulfonic acid diazo, its product (2 Moore) and C.I. Basic Brown 1(C.I. 21000) coupled.

brown. Soluble in water and ethanol for orange brown. In the light of sulfuric acid is palm black, for yellow brown after diluted. The dye solution to join strong hydrochloric acid for brown, have precipitation; Add thick sodium hydroxide solution for orange brown, have precipitation.