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What is the difference between green and black tea?

Both green tea and black tea come from the leaves of the plant Camellia sinensis ; however the processing that the leaves undergo to make the final tea is different. The leaves for black tea are fully oxidised while those for green teas are lightly steamed before being dried.

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Black teas mostly come from plantations in Africa, India, Sri Lanka and Indonesia while green teas come from countries in the Far East such as China and Japan.

From: http://www.teahealth.co.uk/th/facts/1.htm