... used in oil drilling, textile, printing and dyeing, water treatment, paint and coating, papermaking,etc 1)We are the ... manufacturer of reeactive dyes and sodium hydrosulfite, and specializing in manufacture of indigo blue,sulphur black, vat dyes, basic dyes ... , direct dyes, auxiliaries and OBA.2) Use for polyester dyeing & printing3) Color: yellow, orange, red, black, dark blue4) Appearance: Powder ...