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toxic waste sour candy, the sourest candy in the world. I guess it counts for substance too.

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Wiki User

13y ago
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Macarena Henriksdatt...

Lvl 2
2y ago

it's citric acid toxic waste uses it that's why it's sour

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Anonymous

Lvl 1
4y ago

Might be vine acid

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Q: What is the most sour substance on earth?
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