Aluminium potassium sulfate for mordanting cellulose and protein fibres.
Alum is used to allow the natural dyes to penetrate the wool or wool felt. It is a simple compound, with low toxicity.
Available in 250 g bottles...
An excellent 50 page booklet for beginners and experienced dyers alike.
Gives clear instructions on dyeing, with recipes and examples of the colour palettes available when using natural dyes...