Alum powder. Alum may be used in pickling recipes as a preservative to maintain fruit and vegetable crispness. Alum is both a specific chemical compound and a class of chemical compounds. The specific compound is the hydrated potassium aluminium sulfate (potassium alum). More widely, alums are double sulfate salts.
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Creative#:
TOP22304741
Source:
達志影像
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RM
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