chicago sky blue 6B (C.I. 24410) Chicago Sky Blue?B PontamineSkyBlueBX tetrasodium 6,6'-[(3,3'-dimethoxy[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[4-amino-5-hydroxynaphthalene-1,3-disulphonate] Direct Lake Blue 6B 1,3-Naphthalenedisulfonic acid, 6,6-(3,3-dimethoxy1,1-biphenyl-4,4-diyl)bis(azo)bis4-amino-5-hydroxy-, tetrasodium salt 1,3-naphthalenedisulfonicacid,6,6’-[(3,3’-dimethoxy[1,1’-biphenyl]-4,4’-diyl) 6,8-naphthalenedisulfonicacid,3,3’-((3,3’-dimethoxy-4,4’-biphenylene)bis(azo)