physical chemistry - Determine if stuff is Potassium Alum - Chemistry Stack Exchange

How can one determine (at home) if the product shown below is Potassium Alum? I held a piece of it in a gas flame (assuming that the flame would become violet if potassium were present), but there

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Potassium, Definition, Properties, & Reactions

Water relations, measured as electrical resistance of leaves, and

7789-00-6・Potassium Chromate・163-03562・165-03561・167-03565

6100-20-5・Potassium Trihydrogen Dioxalate Dihydrate・162-04132

physical chemistry - Determine if stuff is Potassium Alum - Chemistry Stack Exchange

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7789-00-6・Potassium Chromate・163-03562・165-03561・167-03565