and the scale of the industry will continue to expand.

Indigo dye appears as blue powder or granules, odorless, slightly soluble in water, ethanol, glycerin and propylene glycol, insoluble in grease, and has poor heat resistance, acid and alkali resistance, and oxidation resistance. Indigo dye is one of the oldest textile dyes. It has the characteristics of easy coloring and unique hue. It is widely…