Rhubarb leaves contain oxalic acid, a poisonous substance, but it can be used as a mordant.

Difficulty Level:
Average
Time Required:
4 hours

Here’s How:

1. Wear rubber gloves and protective clothing.
2. Cut rhubarb leaves into small pieces and place in a large dyepot filled with water.
3. Simmer for 2 hours, covered. Avoid vapor inhalation.
4. Strain the mordant liquid, removing the leaves.
5. Place clean, wet wool into the rhubarb mordant liquid and simmer 1 – 2 hours.
6. Allow the mordant to cool before removing the wool.
   
   
   

Tips: