A natural dye often only really shines when its brother, the mordant, is part of the plan.
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.
CREAM OF TARTAR ~ To change colour (PH indicator) and soften fibre
Cream of Tartar, also known as potassium bitartrate, is produced by fermenting grape juice. It is used to acidify the dye bath to effect a colour change, and in mordanting to soften wool fibers as well as slowing down the mordant uptake in a hot mordant bath.
In general Cream of tartar can be dissolved in the dye bath. It helps to lower the PH of the bath.
PH of Cream of tartar is 5.
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