Aluminum sulfate
a white, crystalline, water-soluble solid, al 2 (so 4) 3 , used chiefly as a water-purifying agent, as a mordant, and as a size in the manufacture of paper.
historical examples
vitriol is copper or iron sulfate, saltpeter is pot-ssium nitrate, and alum is an aluminum sulfate salt.
rembrandt’s etching technique: an example peter morse
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