Aluminium sulfate = aluminium sulphate
Natural dyeing – mordanting any fibers : Aluminum sulfate was developped in some dyeing processes at the XIXth Century instead of the potassium alum. It can be used as a mordant on any fiber and does not change the shades. For proteinic fibers, aluminium sulfate can provide an interesting alternative to alum and can be used without cream of tartar.
Also, combinations of aluminum and iron mordants or a last (very light) iron bath after a aluminum-mordanted-colour will widely increase the number of shades.
Aluminium sulfate (or aluminium sulphate) has other common uses : as a flocculating ingredient for the production of drinking water, in the manufacture of paper, as an acidification agent for soils, as an antibacterial agent…