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:
Wear rubber gloves and protective clothing.
Cut rhubarb leaves into small pieces and place in a large dyepot filled with water.
Simmer for 2 hours, covered. Avoid vapor inhalation.
Strain the mordant liquid, removing the leaves.
Place clean, wet wool into the rhubarb mordant liquid and simmer 1 – 2 hours.
Allow the mordant to cool before removing the wool.
Tips:
If you grow rhubarb, the rhubarb leaves do naturally compost in your garden and are not generally considered dangerous
But Rhubarb leaves contain oxalic acid which is toxic. Store covered and keep away from small children or pets.
Rhubarb roots can produce shades of orange and reds.
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