Himalayan Rhubarb extract is a traditional natural dye from the Himalayan mountains between India and Bhutan. The plant grows in altitudes from 3-5000 meters and yields a deep golden yellow color from its rhizomes with an alum mordant. Shifts in pH will create more yellow or nearly brick red colors. The dye is aromatic and earthy smelling and makes a wonderful Bright Olive green when combined with Saxon Blue in the dye pot. Use it at 1-10% on the weight of the fiber and shift its pH with cream of tartar or soda ash.
100 grams of Himalayan Rhubarb will dye approximately 1 kg (2.2 lbs) of fiber.