The molecule is an organic sodium salt that is the disodium salt of 4,5-dihydroxy-3-(phenyldiazenyl)naphthalene-2,7-disulfonic acid. It is used as the plasma stain in trichrome techniques. It has a role as a histological dye. It contains a 4,5-dihydroxy-3-(phenyldiazenyl)naphthalene-2,7-disulfonate.
disodium;4,5-dihydroxy-3-phenyldiazenylnaphthalene-2,7-disulfonate