Rhubarb leaf mordant
Along with chemical mordants like aluminum, copper, and iron, Jenny Dean also notes the use of staghorn sumac leaves, and oak galls as possible sources of natural mordants in Wild Colour: The complete guide to making and using natural dyes. These are rich in tannin she notes, which helps colour adhere and increases light and wash-fastness on vegetable fibres.
However, since I am LOVING spinning wool (and didnt’ love spinning hemp or flax that much in comparison) I really was interested to read about her recommendation for protein fibers – rhubarb leaves. Continue reading