What are the main printing and dyeing processes in the Tang Dynasty?

The printing and dyeing processes in the Tang Dynasty were quite developed, mainly including clip valerian, wax valerian, twisted valerian and alkali printing. Jiagu Jiagu is a direct printing method, which originated and prevailed in the Tang Dynasty. It uses two flower plates engraved with the same pattern, with plain silk to be dyed between them, coated with resist agent, and then dyed to form a white flower effect, and the dyed patterns are symmetrical left and right; Wax Valley Wax Valley is a modern batik. It is to draw melted wax on the fabric first, then dip-dye, heat-boil and dewax, and then the pattern will appear. After the wax liquid is immersed in the fiber, it has waterproof function, and the dye liquid cannot enter, forming a unique decorative effect of white flowers.