The amounts of each substance used in the mix depends on the shade of blue that is desired and the type of fabric to be dyed. Image The isatis tinctoria plant, also known as woad, produces a dye ...

Woad produced yellow dye, madder produced red dye, and woad produced blue dye. These plants were indispensable in the medieval cloth industry, contributing to the prosperity of cities like Mechelen.

The root of the madder plant produced a red colour, woad offered blue and yellow was derived from weld. Plants were soaked in hot water and wool was immersed in the dye bath. Stale urine may have ...