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1 lb.
Non-Member Price:
$7.39
Alum is used to pre-treat fabric or paper before marbling so designs transfer well. Alum is also used with some natural dyes as a mordant, a substance used in dyeing to fix the coloring matter, especially a metallic compound, as an oxide or hydroxide, that combines with the organic dye and forms an insoluble colored compound or lake in the fiber.
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