SODA ASH ~ To change colour (PH indicator) and scouring cellulose fibres
No natural Dye Studio can do without Soda Ash. It may be used in small amounts to alter PH or used for scouring cellulose fibres. Soda Ash is alkaline and used to increase the PH in a dye bath as well as in an Indigo Vat. It also brightens yellows, especially Reseda and Sage.
In general Soda Ash can be dissolved in the hot dye bath at 3-10%. It helps to increase the PH of the bath.