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In page Teeth blackening:

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The word ohaguro was an aristocratic term. There is an alternate term for ohaguro, kane (鉄漿, lit.'iron drink'). At the old Imperial palace in Kyoto, it was called fushimizu (五倍子水). Among civilians, such words as kanetsuke (鉄漿付け), tsukegane (つけがね) and hagurome (歯黒め) were used.[citation needed]