Friends who often drink tea will find that after the remaining tea water is left for a period of time, a layer of "film" will form on the surface of the tea water. Do you know what that is? How was it formed? Can it be quoted? Let’s learn about it with me now.

2025/05/3115:40:34 news 1498

This film formed on the surface of the remaining tea water we usually call it “tea film”. It is formed by the interaction between air, tea polyphenols and calcium carbonate ions on the surface of the tea water and undergo chemical reactions. This kind of tea film is more easily formed in black tea.

Scientists have found that "film" will only form when calcium ions , bicarbonate ions and oxygen act simultaneously. The more calcium ions, the easier it is to form, that is, the higher the hardness of water used for making tea, the easier it is to form a tea film. Therefore, we can initially judge the hardness of drinking water at home based on the amount of tea film formed.

tea film is just some insoluble small particles attached to the surface of organic matter. It has no taste, does not affect the taste, and is harmless to the human body, so everyone can drink it with confidence.

Have you learned it? Come and follow the tea film to see the hardness of your water .

Material source: Popular Science China

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