Black ink hēimò (black ink), ink stick, refers to the use of a long strip on the inkstone when researching ink, and the ink comes from the ink stick. Ink sticks are used to grind ink. In ancient times, the rich scholar "old man" asked extremely "maid" to help them grind ink. Modern people have a fast pace of life and few people use it. Grinding ink requires clear water. If there are impurities in the water, the ground ink will be impure. As for adding water, it should not be too much at first, so as not to soften the ink or splash it on it. Should be gradually added. Ink school: There is a so-called "pen school" in Liu Gongquan, and so is grinding ink. The right ink is also correct. If the ink is not straight or oblique, it is neither elegant nor uniform.