Commonly known as tea tannin, is a unique composition of tea, with bitter, astringent and convergence.

俗称茶单宁，是茶叶特有成份，具有苦、涩味及收敛性。

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Tannin is the chemical that contributes to the bitterness and astringency in tea.

单宁酸是造成茶喝起来苦涩的化学物质。

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A wet tea bag can replace the gauze pads. Tannin contained in tea can help reduce the bleeding.

可以用湿茶包代替纱布，茶叶里所含的单宁酸可以帮助减少出血。

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