It is water-based ink. Delicate modifications to detail, you can white punching. Water resistant, you can firmly white at once. However, on the other hand, since the muddy, depending on the writer s Some people that difficult to do the work. Once you have solidified ink is dry, you can also extend by adding the water. Just because the water resistance falls, please note. White, use it with the brush. * When attached to the pen tip, the pen tip mass, will not put a beautiful line drawing even wash.