The expansion of synthetic chemical industry has brought about a decline in the use of natural products. Still, some categories of synthetic dyes such as azo dyes are carcinogenic, due to which some of the western countries have banned the usage of such dyes in textile applications.
Government of India, Department of Environment and Forest has also brought out a Gazette banning the usage of 74 azo dyes.
Sourced from plants, animals and minerals, origin of mankind can be justified. Vegetable dyes are the secretion products found almost universally in plant tissues.
Available in various forms like wood, leaves, roots & tubes, barks ,flower, fruits, seeds, litchens, they are ecologically friendly and do not create pollution to air and water.
Natural organic dyes and pigments cover a wide range of chemical classes such as Amine, Quinones, Flauanols, Flauanones, and Indigoids etc.
Cotton fabrics can be pre-mordanted with different mordents and then dyed with 4 natural vegetable dyes to get different colors.