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The basics
(Aka Sodium Sulfate) Improves the yield of Fiber Reactive Dye. (Gives more intense color).
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The benefits
Use in place of, and in the same proportions as, plain salt.
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The uses
Also used as a leveling agent for production dyeing with Leveling class Acid Dyes for wool and silk to get the most even results.
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The pro tip
Approximately 1 1/4 cups per lb, but that can vary based on the density.
