The Alum (KAl(SO4)2) is a metallic salt and the most commonly used mordant in natural dyeing.
In natural dyeing, the mordant has the function of enabling the chemical bond between the fibers and the dye, improving the color fastness and intensity.
It is available in bags of 100gr, 500gr and 1Kg.
We now have an online mini-course available to teach you how to scour, mordant and finish textile fibers for Natural Dyeing!
These procedures are fundamental for your dyeing to have good results, uniform and vibrant colors and good resistance to light and washing.
Our course includes lessons for protein and cellulosic fibers, namely wool, silk, cotton and linen. Fibers can be dyed in a variety of ways, such as loose fiber, yarn, fabric, and even finished garments.
Link: Mini course - How to scour, mordant and finish textile fibers for Natural Dyeing