|
Rhubarb (Rheum spp)
 Tibetans use the liquor from boiled rhubarb leaves as natural mordant that works best with animal fibres.
Apparently, a pound of rhubarb leaves can mordant several pounds of fibre. Make sure you boil the leaves in a well-ventilated area, as the fumes can cause problems, and note that rhubarb leaves contain oxalic acid, which is a poison, and should not be eaten. Rhubarb roots as a dye
|