In addition, pure blue ink is also one of the commonly used inks. For pure blue ink, ink blue is the main pigment. In the long run, the ink blue will be oxidized and discolored by oxygen in the air, and the handwriting will become blurred. Pure blue ink can be made by adding tannic acid, copperas and other materials into pure blue ink. Under normal circumstances, ink can't be left for too long, especially in an ink bottle with a dip pen inserted in the bottle mouth, the water in the ink bottle will slowly evaporate, so be sure to pay attention.
Ink is divided into dye ink, pigment ink and thermal transfer ink. It is a liquid containing pigments or dyes, and ink is used for writing or painting. When people think of ink, they usually think of pen or brush ink first, but in fact, the most used ink is printing ink.