Dyeing

Salts plays important role in reactive dyeing by improving the affinity of the dyestuff towards the fibre and acceleration of the dyestuff's association and lowering its solubility. Normally, Glauber's salt or common salt/ vacuum salt is used for this purpose. 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.

Soda Ash= sodium carbonate (Na2CO3) (To raise the pH)

Soda ash changes the pH of the fiber-reactive dye and cellulose fiber so that the dye reacts with the fiber, making a permanent connection that holds the dye to the fiber. It actually activates the fiber molecules so that they can chemically attack the dye.