What is vegetable printing and dyeing?

Botanical printing and dyeing is the use of plant dyes for printing and dyeing, plant dyes are extracted from plants, printing and dyeing need to be added to the mordant, but also need to be added to the color fixing agent to enhance the fastness to washing. From the production practice, plant dyes and industrial dyes, the same, need a trace of heavy metals to have a good effect.

Currently, vegetable dyes can only dye medium and light colors, can not dye thick black, the price is relatively high, has not been used in a large area.