While green tea usually loses its flavour within a year, black tea retains its flavour for several years. · Two principal varieties are used for black tea - the small-leaved Chinese variety plant (C. sinensis sinensis) and the large-leaved Assamese plant (C. sinensis assamica). · An average serving of brewed coffee contains 145 mg of caffeine, the same serving size of green tea provides 25 mg (black tea provides 47-60 mg and white tea 15 mg).
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