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Immersion or Vat dyeing with fiber reactive dyeIn immersion dyeing (bucket or washing machine dyeing) cellulose fibers or silk, using fiber reactive dyes such as Procion MX or Sabracron F, salt is important in helping to drive the dye out of the vast amount of water (which is necessary for smooth, even, unstreaked dyeing) onto the fiber. Use one cup per gallon of water, or follow whatever recipe you have already. Add the salt to the water separately from the dye - dissolve the dye first in water, before adding to the tub full of salt water - because salt makes the dye less likely to dissolve in water.