This requires great attention. The dish brush is OK, but it is best not to take it outdoors. The wind is hard in spring. If it is blown directly by the wind, it will easily crack in a few minutes, so everyone should try to play indoors and put it directly in a sealed bag when not playing.

Two: oil to prevent cracking

Olive oil has a good effect on preventing cracking of wenwan walnut. Brush the walnut carefully for several times, then drop the wenwan olive oil on the brush, one drop is enough, then wipe the olive oil evenly on the bristles with your fingers, and then brush the olive oil on the walnut with the brush. In order to make the olive oil more even, don't brush it directly, first knock the brush with olive oil on different parts of the walnut several times, so that the olive oil will be scattered everywhere when it is the strongest, then brush the olive oil evenly with the brush, and then dry the olive oil dish by hand until it is absorbed, but it can still be stored.

Three: Anti-cracking of patina

This operation is a bit difficult, and it needs to be done when the walnut is the weakest in the early stage. The most ideal operation is to brush more wenwan brushes. This process is troublesome, and it needs long-term brushing and fast brushing. It is recommended to combine wenwan nano-brushes and bristle brushes, replenish oil when brushing with bristles, and pack the pulp before pulping when brushing with wenwan nano-brushes. There are many kinds of bristle brushes, and the hardest boar bristle brush has the best effect.