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Aluminum Potassium Sulfate or "alum" is frequently used by dyers. It improves light and wash-fastness of natural dyes. Using alum as a mordant keeps color clear and can be used with both protein and cellulose fibers. Use at 10%-20% WOF. Available in 8oz.
May we suggest the perfect pairing?
Blue-faced Leicester (BFL) wool hank
Natural dyeing with plants by Franziska Ebner + Romana Hasenohrl