1-Naphthalenesulfonic acid, 6-((2-hydroxy-1-naphthalenyl)azo)-, monosodium salt, mixt. with 7-((2-hydroxy-1-naphthalenyl)azo)-1-naphthalenesulfonic acid monosodium salt 6-((2-Hydroxy-1-naphthalenyl)azo)-1-naphthalenesulfonic acid monosodium salt, mixt. with 7-((2-hydroxy-1-naphthalenyl)azo)-1-naphthalenesulfonic acid monosodium salt 8003-59-6