Potassium Aluminum Sulfate is probably the most commonly used mordant by Natural dyers of both protein and cellulose fibers. It is used to improve both the lightfastness and washfastness as well as creating bright clear colors. It is safe when handled properly and relatively inexpensive. 

Potassium Aluminum Sulfate

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$1.95 USD
$2.20 USD
$2.60 USD
$3.90 USD
$7.15 USD