Both the alkali leuco and the acid leuco dyeing displayed significantly lower colour loss
compared with that obtained for the acid dyeing, despite both types of vat dyeing being of considerably greater colour strength than their acid dye counterparts. In addition, the alkali leuco dyeing did not impart any staining to the adjacent nylon and wool
materials and the acid leuco dyeing imparted little staining to the adjacent nylon component during washing.