Explanatory notes
… solution or, in the case of certain vegetable materials, by fermentation. They are relatively complex materials and … cutch (acacia catechu), annatto, madder, alkenna, henna, turmeric, Persian berries, safflower, saffron, etc. The … (mainly Indigofera tinctoria ). It is generally in the form of dark blue powder, paste, cakes, lumps, etc. (2) …