Natural Dyeing: Part Three.

Alum Mordant Bath: Tannin fabric on left of pot (slightly darker).
Step Three: A second mordant bath of Alum Acetate. A "mordant" functions as a chemical bridge, binding to both the dye and the fabric more effectively than either can bind to the other. Making the dye permanent. A lots of natural plants or flowers can produce color, but will not last through light exposure or washings. Mordants can also shift the color of the dye. 

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