3-Hydroxy-4-(4-sulfo-[1]naphthylazo)-naphthalin-2,7-disulfonsaeure, (Naphthalin-sulfonsaeure-(1))-(4 azo 1)-(naphthol-(2)-disulfonsaeure-(3.6)), 3-hydroxy-4-[(4-sulfonaphthyl)azo]naphthalene-2,7-disulfonic acid, 2-Hydroxy-[1.1']azonaphthalin-trisulfonsaeure-(3.6.4'), 1-(4-sulfo-1-naphthylazo)-2-naphthol-3,6-disulfonic acid, amaranth, 3-OH-4-[(4-SULPHONAPHTHYL)AZO]NAPHTHALENE-2,7-DISULPHONIC ACID