We are going to prepare crystals of potassium alum at home, no chemistry set required.
My books on Amazon www.amazon.it/shop/dario.bres...
Here's a 1kg pack of alum amzn.to/2QSXTQl but you can look for smaller ones too (look for "Rock alum" or "potassium alum" or even just "alum").
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15 янв 2020
