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Why do most tea leaves need to be rolled?

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Why do most tea leaves need to be rolled?

19 Mar, 2020

Different tea leaves have different twisting times and different rolling functions.

For black tea: Black tea is a fully fermented tea that requires a chemical reaction between enzymes, tannins and other substances in the air and oxygen in the air. However, usually, these substances in the cell wall are difficult to react with air. so you need to use a twisting machine to twist and break the cell wall of fresh leaves, make cell fluid flow out. These substances in the fresh leaves are in full contact with the air for oxidative fermentation.The degree of twisting determines the different soup color and taste of black tea.