Amido Black 10B (acid form)
amido black 10b (acid form)
A bis(azo) compound that is naphthalene-2,7-disulfonic acid in which the hydrogens at positions 3, 4, 5, and 6 are replaced by (<em>p</em>-nitrophenyl)azo, amino, hydroxy, and phenylazo groups, respectively. A biological stain, it can be used interchangeably with its disodium salt, Amido Black 10B.