The water pen uses ink as pure water, and the paper has a strong absorbability. Water pen is generally used in the absorption surface, even on the non - absorption surface, can also be erased, writing on the paper generally has no back marks. The advantage is that the writing feel and the writing quality are good, the shortcoming is that the ink viscosity is small and the writing length is small, that is, the words can be written down under the same amount of ink. Water pen is less tasteless than oily pen, the pen tip is not easy to dry, its handwriting is light but not water resistant, water will be rendered, and it is easy to break water.
The oil pen is oil-based, hard to dissolve in water, and it is not easy to fade and turn off. The oil pen can be written on the absorption surface and the non absorbing surface, and it is not easy to be erased. It is written on white paper, with obvious back marks on the back. It is often used for occasions requiring marking. The advantage is that the ink viscosity is large and the writing length is large, that is to say, more words can be written under the same amount of ink; the shortcoming is that the writing feel and the writing quality are not good.
The ink properties of neutral pen are between the water-borne pen and the oil pen. The storage time is longer than that of the water pen, and it is not easy to turn on the water, but the quality is not as stable as that of the oil pen. When writing a document that needs to be saved, it is often used as a neutral pen.