Pre-reduced Indigo Acid Dye, 3 oz. This specially formulated indigo is already 60% reduced, allowing you to use soda ash instead of lye in the dye vat. Extremely easy to use, pre-reduced indigo makes setting up an indigo vat almost effortless. There is no need to paste up the indigo granules because they dissolve easily in water. While Indigo and the chemicals used are comparatively safe and non-toxic, it is best to treat them all with caution. Wear rubber gloves and respirator to minimize contact. Always work in a well ventilated area.