Calcium hydroxide

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What Wikipedia says

Calcium hydroxide (traditionally called slaked lime) is an inorganic compound with the chemical formula Ca(OH)2. It is a colorless crystal or white powder and is produced when quicklime (calcium oxide) is mixed with water. Annually, approximately 125 million tons of calcium hydroxide are produced worldwide.

Excerpt from the Wikipedia article “Calcium hydroxide”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Picture taken by w:User:Walkerma in June 2005., Public domain, via Wikimedia Commons.