Elephant's toothpaste

Rarity: Common

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Notion

Domain

Science and technology

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What Wikipedia says

Elephant's toothpaste is a hot foamy substance caused by the quick decomposition of hydrogen peroxide (H2O2) using potassium iodide (KI) or yeast and warm water as a catalyst. How rapidly the reaction proceeds primarily depends on the concentration of hydrogen peroxide.

Excerpt from the Wikipedia article “Elephant's toothpaste”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: https://www.flickr.com/photos/eigenadam/, CC BY-SA 2.0, via Wikimedia Commons.