Sulfur dioxide
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This article/section is a stub — probably a pile of half-sorted notes and is probably a first version, is not well-checked, so may have incorrect bits. (Feel free to ignore, or tell me) |
Sulfur dioxode (E220) is used as a preservative.
It is also the smell found at volcanic sites.
It is toxic in large amounts, and not tasty at moderate amounts, but neither is an issue in the amounts found in food.