oak gallnut

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Oak gallnuts are commonly used as a pre-treatment to cellulose fibers and fabrics before alum mordanting. Due to its limited compatibility with plant-based fibers, alum needs to be preceded by an oak gallnut mordant. These tannin-rich galls, formed from the oak tree in response to insect eggs, are collected and powdered before use at a rate of 10-12% WOF or 6-8% for gallnut extract.