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ChEBI: Basic brown 1 is a bis(azo) compound that is 1,1'-(1,3-phenylene)bis(diazene) in which both azene hydrogens are replaced by 2,4-diaminophenyl groups. A metachromatic dye which stains acid mucins yellow. It is also a constituent of Papanicolaou's EA solutions, used for cervical, and other smears. Its dihydrochloride salt is also a biological dye known as Bismark brown Y. It has a role as a fluorochrome and a histological dye. It is a bis(azo) compound, a member of azobenzenes, a tetramine and a substituted aniline.