Ohaguro

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

Ohaguro (Japanese: お歯黒; pronounced [ohaɡɯɾo], lit. 'black teeth') is the name given in Japan to the custom of blackening one's teeth with a solution of iron filings and vinegar.

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

Image: Utagawa Kunisada, Public domain, via Wikimedia Commons.