22 minutes ago, liuzhou said:
For the simple reason that the drink is more red than black. Brew some 'black' tea and pour it into a glass without cow juice and see what colour it is. China names it for the colour of the infusion; not the dried leaf.
Edited to note: I did forget to translate 红茶. I have now edited original post.
There we go.
Many thanks.
ETA: I do drink mine without cow juice, and appreciate the colour.