ingredient information
Sodium Aluminum Sulfate
Sodium aluminium sulfate, NaAl(SO4)2·12H2O or Na2SO4·Al2(SO4)3·24H2O, also known as soda alum or sodium alum, is a form of alum used in the acidity regulator of food (E521) as well as in the manufacture of baking powder. It is also a common mordant for the preparation of hematoxylin solutions for staining cell nuclei in histopathology. The classical cubic alum structure is the dodecahydrate, which is known in mineralogy as alum-(Na).[2][3] Two other rare mineral forms are known: mendozite (undecahydrate)[4] and tamarugite (hexahydrate).