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