... SODIUM SULFITE(cas no.7757-83-7) hair dye intermediate ,96% purity, strict quality control,GMP,ISO provide COA&MSDS Product name Sodium ... reasons as follows:FeaturesProduct Name:Sodium sulfiteSynonyms:Sodium sulfite anhydrous;SODIUM SULFITE, EXSICCATED;SODIUM SULPHITE;anhydroussodiumsulfite;disodiumsulfite;exsiccatedsodiumsulfite; ... grey powder hair color/dye SODIUM SULFITE(cas no.7757-83-7)