Other Names: Concentrated alum, Paper-maker's alum, Sulfate of alumina
Appearance: Pale green to white in colour and is available in powdered and granular forms
Uses Can be used as a substitute for alum as a hardener (ratio = 2 parts aluminium sulphate as a substitute for 3 parts alum).
Chemical Formula Al2(SO4)3 . 14H2O
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