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Black Tea and Green Tea

Broadly speaking, there are two types of tea, green tea and black tea.

What is the difference?

The leaves of the tea plant contain fermentation enzymes, so if they are untreated, tea leaves ferment naturally. If the fermentation completes, you get black tea, while if you stop it part way through you get half-fermented teas such as oolong tea.  On the other hand, if the tea leaves are treated with steam soon after harvesting to stop fermentation, you get green tea.

English people, who imported tea from China in the eighteenth century, believed that these two kinds of tea, black tea and green tea, were made from different plants.

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