Thiourea Dioxide (Thiox) is used to strip color and discharge print on cotton, wool or silk. When used correctly, Thiox can safely replace chlorine bleach used in vat dyeing, discharge printing and general color stripping on cellulose and protein fibers. (Thiox is five times stronger than Sodium Hydrosulfite/Chlorine Bleach). This is a Pro Chemical & Dye product; for detailed MSDS sheets, visit www.prochemicalanddye.com. Good ventilation while working is necessary, as is the use of a respirator with Acid Gas cartridges.