The 'Foam' on the Tea Soup Surface - Tea Saponin
When brewing tea, a layer of 'foam' often appears on the surface of the tea soup, particularly more abundant in the first two or three infusions. This 'foam' is not pesticide residue or impurities from the tea leaves, but rather a substance called tea saponin. Scientific research has shown that tea...
Tea News · Nov 28, 2025
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