Check the listing for details. Natural Dye - Oak Gallnut - Powdered Extract - 4 ounce package. Condition: New. Listed at 19.60 USD. Oak Gallnut Extract, a natural extract prepared from Quercus Infectoria OlivierAny fiber can be dyed with oak gallnuts. It is used to increase lightfasntess.Oak Gallnut can be used to create dark shades with madder or indigo on wool and silk with minimal use of iron sulphate.This gallnut extract was especially developed for textile and natural dyeing uses : a very high content in tannic acid combined with low color. The tannic acid is perfect for the pre-treatment of cellulosic vegetable fibers (named engallage in this case) to improve the fixation of the mordant during the mordanting step.The oak galls are produced by the tree as a defense against the sting of an insect in buds. The tree excretes a tannin-rich substance that becomes hard and forms a gallnut.Gall Oaks are present around the Mediterranean Sea and in Minor Asia. Sold in 4 ounce package, Ships from the USAInstructions for use included! **Buyer responsible for import/export rules to their country.**Know your laws! Not all products are legal to ship to your country and may be seized by customs. We cannot offer refunds or reships should this happen.