Tea such as Keemun, Darjeeling, Yunnan, Assam and Uva etc are called “black tea” in English. Japanese call the teas “kocha” which literally mean “red tea”. You take the tea black while we take it red. Isn’t that interesting? Seemingly, the color of “black” comes from the leaf color and its “red” comes from the liquid color.
When we say black tea in Japanese (kurocha or kokucha in Japanese), it refers to fermented teas like “goishi-cha”. I know it is confusing, but I also know tea is always good to us.