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Tannic Acid or tannins is a mordant (fixative) for natural dyes on plant based (cellulose) fabrics. It is best used along with alum to get deeper, richer colors on cottons, linens, hemp and rayon. (You mordant the fabric first in a hot bath of alum and tannic acid, then put the fabric in the dye pot with the natural dye. We have some grea