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Review Summary
Concentrated alum
Paper-maker's alum
Sulfate of alumina
Colorless crystals
Can be used as a substitute for alum as a hardener (ratio = 2 parts aluminum sulfate as a substitute for 3 parts alum).
Al2(SO4)3 . 18H2O
100g (3.53oz)
The Photographers' Formulary 100g Aluminum Sulfate Can be used as a substitute for alum as a hardener (ratio = 2 parts aluminum sulfate as a substitute for 3 parts alum).
Note:
Stable under ordinary conditions of use and storage.