Alum - mordant for dyeing wool with natural dyes

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Make your dye project a success with aluminum sulfate. Alum is a powdered presoak used to treat fabric or wool. Alum is also used with some natural dyes as a mordant.  Mordanting fiber prior to using natural dyes is critical to ensure colorfastness of the finished yarn.  This package contains one pound of aluminum sulfate. Made in USA.