indigotin

Then, the cloth will be dipped dyeing in the indigotin.

Hall states that the ancient Egyptians created their blue dye "by using indigotin, otherwise known as woad."

To bleach that dye out I'll have to go over his face with a needle, pore by pore, and hammer in the indigotin disulphonic.

The leaves were soaked in water and fermented in order to convert the glycoside indican present in the plant to the blue dye indigotin.