Ball pen with viscosity between water and oil is called neutral pen, which originated in Japan and is a novel writing tool popular in the world. Neutral pen has the advantages of both fountain pen and ballpoint pen. It is comfortable to write, low ink viscosity and easy to lubricate, so it is smoother than ordinary oil ballpoint pen. It is an upgrade product of oil ballpoint pen.
1. The friction between the neutral pen and the paper surface is small, and the writing is very slippery. It is difficult for the person who has just practiced writing, especially when writing horizontal and vertical, it is easy to shake.
2. The neutral pen is easy to carry, cheap, easy to replace and takes a long time.
3. Writing feels comfortable, ink viscosity is low, and easy to lubricate material is added, so it is smoother than ordinary oil ballpoint pen.
4. The nature of the ink used is between the water-based pen and the oil-based pen, and the preservation time is longer than that of the water-based pen.