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Cream o' Tartar // Potassium Bitartrate

Cream o' Tartar // Potassium Bitartrate

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Used to bring out the red of cochineal on protein fibers in natural dyeing.

Also in mordanting with alum.  Add 1/2tsp to 1 tsp of alum to soften protein fibers.  Wool can be brittle especially if not added to mordant bath.