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sodium aluminium sulphate
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.