Efflorescence

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

In chemistry, efflorescence (from the Latin efflorescere, 'to flower') is the migration of a salt to the surface of a porous material, where it forms a coating. The essential process involves the dissolving of an internally held salt in water or occasionally, in another solvent.

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

Image: User:Mattes, Public domain, via Wikimedia Commons.