Koukaboku sumi ink sticks ( 紅花墨 红花墨)
In 1739, Matsui,Motoyasu, the sixth successor of Kobaien, went to Nagasaki Prefecture in Japan.
There he interacted with ink craftsmen of the Qing dynasty and collaborated with them on the production of ink. Koukaboku is one of the best inks born from that study.