What is a big white cloud writing brush?

Compared with other soft brushes, the big white cloud brush is a kind of brush with moisture and elasticity.

Compared with other soft brushes, big white clouds, middle white clouds and small white clouds. Pure wool pens are too soft and generally do not work well. Baiyun pen is better, because the outer layer is wool, and the middle part is hard and stiff, which can hold water and is elastic.

Extended data:

The outer layer of the big white cloud brush is wool, and the middle is hard wool, which can contain water and is elastic.

The big white clouds are centered on hard hair and surrounded by soft hair, and the brushwork is between hard hair and soft hair. Generally, the production ratio of purple wool and sheep wool is different. For example, "three purple and seven sheep", "seven purple and three sheep", "five purple and five sheep" and so on. There are also double brushes made of wool and wolf hair.

Baidu Encyclopedia-Baiyun (Gongbi Pen)