noun
tea stain; tea incrustation
Refers to brownish stains or buildup from tea, especially on cups, teapots, or teeth.
急須に茶渋がついてしまった。
Tea stains have built up inside the teapot.
歯の茶渋が気になる。
I'm bothered by the tea stains on my teeth.
Compound of 茶 (tea) and 渋 (astringency, stain). The term refers to the brownish residue left by tea.