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How does drying finish the processing of black tea leaves?
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tea
Rows of tea (Camellia sinensis) growing in Japan, with Mount Fuji in the background.
In the production of black tea, the drying stage serves as the final step to stabilize the product and develop its characteristic profile. This process performs three essential functions:
- Enzyme Inactivation: The application of heat effectively inactivates polyphenol enzymes, which halts the chemical reactions initiated during the fermentation stage.1
- Moisture Reduction: The leaf is dried until it reaches a moisture content of approximately 3 percent, which is necessary for preservation and quality.1
- Flavor and Color Development: The heat caramelizes sugars within the leaf, contributing to the final flavor profile. Additionally, this stage imparts the distinct black color associated with fermented tea.1
To ensure quality, the leaves are typically dried using heated forced air in mechanized chambers and are cooled quickly afterward to prevent overdrying.1