Similar names: 1-Naphthol-3,6-disulfonic acid, 2,2'-(3,3'-dihydroxy-4,4'-biphenylylenebisazo)bis[8-amino-, dicopper deriv., tetrasodium salt (6CI); C.I. Direct Blue 218 (8CI); Copper, [tetrahydrogen-3,3'-[(3,3'-dihydroxy-4,4'-biphenylylene)bis(azo)]bis[5-amino-4-hydroxy-2,7-naphthalenedisulfonato](4-)]di-, tetrasodium salt (7CI); Cuprate(4-), [μ-[[3,3'-[(3,3'-dihydroxy[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[5-amino-4-hydroxy-2,7-naphthalenedisulfonato]](8-)]]di-, tetrasodium; Cuprate(4-), [μ-[[3,3'-[[3,3'-di(hydroxy-κO)[1,1'-biphenyl]-4,4'-diyl]bis(azo-κN1)]bis[5-amino-4-(hydroxy-κO)-2,7-naphthalenedisulfonato]](8-)]]di-, tetrasodium (9CI); 2,7-Naphthalenedisulfonic acid, 3,3'-[(3,3'-dihydroxy[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[5-amino-4-hydroxy-, copper complex; Amanil Supra Blue 9GL; C.I. 24401; Carta Blue VP; Direct Blue 218; Fastusol Blue 9GLP; Intralite Blue 8GLL; Pontamine Bond Blue B; Pontamine Fast Blue 7GLN