Sodium Hydrosulfite is a reducing agent for setting up an Indigo vat. Sodium Hydrosulfite may also be used on the stovetop as a non-aggressive alternative to bleach for removing color from natural fabrics.
1 lb/0.45 kg (Item CHM1025) pictured
5 lb/2.3 kg (Item CHM2025)
6 oz/150 g Sodium Hydrosulfite in 4 gal water.