Grocery store Washing Soda almost invariably is improved by the addition of bleaching agents. It s a good rule to get your Soda where you get your dye to be sure of purity. Two recipe changes are the key. And raise the temperature of the dyebath gradually to a simmer. This recipe dyes one pound of fiber to a medium shade.
Results vary with the fiber used.
To dye more than a pound, scale all quantities upwards proportionately. To dye less than a pound, scale down. For lighter or darker shades, use less or more of all the powders, keeping the same proportions among them. For very dark colors, leave fiber in the dyebath for a longer time, up to twenty-four hours. For still darker shades over-dye do the entire process again.