Black tea is the most oxidized form of the tea varieties that contains the most amount of caffeine and has the strongest flavour. As with most of the other tea varieties, black tea comes from the large-leaved Assamese plant (camellia sinensis assamica). Black teas are brewed for about 4 minutes and are usually steeped for a minimum of 30 seconds to a maximum of 5 minutes at around 99°C (210°F) to avoid bitterness due to oversteeping; lower temperatures are used for more delicate black teas. Many of the active substances in black tea do not develop at temperatures lower than 90°C (194°F).
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