About Bokujyu ink
Ready to use Sumi inks are called Bokujyu in Japanese. They are liquid Sumi and last a while in the bottle.
It is very handy to use for a quick practice, but it often doesn’t create the beautiful Sumi ink characteristics such as color gradation. Because creating your own Sumi ink with Suzuri is an important part of Shodo practice, a way to calm and clear your mind, you should use Bokujyu wisely.