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Classification and application of plant dyes The classification of plant dyes has a variety of methods, according to the chemical composition can be divided into: chlorophyll, carotenoids, curcumin, indigo, anthraquinones, naphthoquinones, Class seven categories. Natural plant dyestuffs are all colors, but bright and bright enough, many varieties of washing and climate fastness is not satisfied, its concentration and hue is not stable. More satisfied with the plant dyes are: turmeric, march yellow, safflower, quercitrin, madder pigment, indigo, gardenia blue, chlorophyll, pepper red and hematoxylin and so on. For silk, wool and other protein fiber dyeing more plant dyes, chromatography more complete. The main dyes are indigo, gardenia blue, chlorophyll, pepper red, hematoxylin, cocoa color, gardenia yellow, turmeric and tea, and so on. There are fewer kinds of plant dyes for synthetic fiber dyeing, less chromatographic, poor coloring rate, shellac, turmeric and onion dyes can be washed and stained in the weak acid conditions with high temperature and high pressure (the first media after dyeing) Better coloring.
Plant dyes are derived from the roots, leaves, trunks or fruits of plants. It is estimated that at least 1000 to 5000 species of plants can extract the pigment. Such as calamus, Lithospermum, hematoxylin, indigo, safflower, pomegranate, holly, bayberry, persimmon, yellow gardenia, mulberry, tea and so on. Plant dyes are mainly used for food and cosmetic coloring, China in recent years has also developed dozens of different sources of plant pigments. Textile dyeing as early as thousands of years ago has been the use of plant pigments, minority areas so far batik, tie dye also applied natural plant pigment.
