The name kobicha comes from the
Japanese for the colour of a type of kelp tea, but the word was often used as a synonym for a form of flattery[3][4] in a curious parallel with the English usage brown nosing.
References
^Nagasaki, Seiki. Nihon no dentoshoku : sono shikimei to shikicho, Seigensha, 2001.
ISBN4-916094-53-0