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Also Known As: Powdered Alum, Iron-Free Aluminum Sulfate, Potassium-Free Aluminum Sulfate or Alum Baking Powder. Alum Powder is not used for its flavor, but for its chemical properties in pickling and baking.
Alum powder is used in pickling, baking and as a preservative and is the main reason pickles are crispy (who knew?)! Use roughly one ounce of alum powder per gallon of water when pickling.