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Alum

Level 4Significant concernsIn Winter's Dictionary

Alum is a other — Styptic; hardens gelatin; used in packaging

Also: Potash Alum, Aluminum Ammonium Potassium Sulfate

What it does

Styptic; hardens gelatin; used in packaging

Where you'll see it

Packaging materials; previously food applications

What the research says

Has produced gum damage and fatal intestinal hemorrhages. Low toxicity experimentally but ingestion of 30 grams has killed an adult. In concentrated solutions causes kidney and gum damage.

Regulatory status

  • US FDA: NUL
  • Notes: GRAS when used in packaging only

Sources

  • A Consumer's Dictionary of Food Additives (Winter): ingestion of 30 grams (an ounce) has killed an adult human