Sum of volatile matter (at 135 ☌) and chlorides and sulfates (calculated as sodium salts), not more than 13 percent. Mercury (as Hg), not more than 1 part per million. Lead (as Pb), not more than 10 parts per million.Īrsenic (as As), not more than 3 parts per million. Sum of 4,5-dihydro-5-oxo-1-phenyl-4-1 H-pyrazole-3-carboxylic acid, disodium salt, and 4,5-dihydro-5-oxo-4-(phenylazo)-1-(4-sulfophenyl)-1 H-pyrazole-3-carboxylic acid, disodium salt, not more than 0.5 percent.Ĥ-Aminobenzenesulfonic acid, sodium salt, not more than 0.2 percent.Ĥ,5-Dihydro-5-oxo-1-(4-sulfophenyl)-1 H-pyrazole-3-carboxylic acid, disodium salt, not more than 0.2 percent.Įthyl or methyl 4,5-dihydro-5-oxo-1-(4-sulfophenyl)-1 H-pyrazole-3-carboxylate, sodium salt, not more than 0.1 percent.Ĥ,4′-(1-Triazene-1,3-diyl)bis, disodium salt, not more than 0.05 percent.Ĥ-Aminoazobenzene, not more than 75 parts per billion.Ĥ-Aminobiphenyl, not more than 5 parts per billion.Īniline, not more than 100 parts per billion.Īzobenzene, not more than 40 parts per billion.īenzidine, not more than 1 part per billion.ġ,3-Diphenyltriazene, not more than 40 parts per billion. Water-insoluble matter, not more than 0.2 percent.Ĥ,4′-1 H-pyrazol-1,3-diyl]bis, trisodium salt, not more than 1 percent.Ĥ-2-yl)hydrazono]-4,5-dihydro-5-oxo-1-(4-sulfophenyl)-1 H-pyrazole-3-carboxylic acid, tetrasodium salt, not more than 1 percent.Įthyl or methyl 4,5-dihydro-5-oxo-1-(4-sulfophenyl)-4-1 H-pyrazole-3-carboxylate, disodium salt, not more than 1 percent. Sum of volatile matter at 135 ☌ (275 ☏) and chlorides and sulfates (calculated as sodium salts), not more than 13 percent. This amine is diazotized and the resulting diazonium salt is hydrolyzed to the desired 2-formyl-5-hydroxybenzenesulfonic acid. The intermediate 2-formyl-5-hydroxybenzenesulfonic acid is prepared by the potassium permanganate oxidation of 2,2′-(1,2-ethenediyl)-bis(5-aminobenzenesulfonic acid) to sodium 5-amino-2-formylbenzenesulfonate. The leuco base is then oxidized with lead dioxide and acid or with dichromate and acid to form the dye. 3 is manufactured by the acid catalyzed condensation of one molecule of 2-formyl-5-hydroxybenzenesulfonic acid with two molecules from a mixture consisting principally of 3-īenzensulfonic acid, and smaller amounts of 4-īenzenesulfonic acid and 2-īenzenesulfonic acid to form the leuco base. ) with smaller amounts of the isomeric inner salt disodium salt of N-ethyl- N- amino]phenyl](4-hydroxy-2-sulfophenyl)methylene]-2,5-cyclohexadien-1-ylidene]-4-sulfobenzenemethanaminium hydroxide of N-ethyl- N-amino]phenyl](4-hydroxy-2-sulfophenyl)methylene]-2,5-cyclohexadien-1-ylidene]-4-sulfobenzenemethanaminium hydroxide and of N-ethyl- N-amino]phenyl](4-hydroxy-2-sulfophenyl)methylene]-2,5-cyclohexadien-1-ylidene]-3-sulfobenzenemethanaminium hydroxide. 3 is principally the inner salt disodium salt of N-ethyl- N-amino]phenyl](4-hydroxy-2-sulfophenyl)methylene]-2,5-cyclohexadien-1-ylidene]-3-sulfobenzenemethanaminium hydroxide (CAS Reg. Listing of Color Additives Subject to Certification
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