1. Grinding is undoubtedly the most common method. For those polished by power tools and those polished by sandpaper, the best way is to grind them from rough grinding to fine grinding, so as to achieve a smooth and bright effect. However, the result is that the matrix will be damaged after treatment, and the surface will be visible, and the ideal effect will not be achieved without special care. Moreover, this treatment is very time-consuming and labor-intensive, seemingly simple, but it is not easy to do.

2. Some strange stone surfaces can be treated by sandblasting, which can be simple and effective. What is rare is that the surface is natural after the treatment is completed. Almost all the pine stones on the market now have been sandblasted.

3. Cleaning with hydrochloric acid and oxalic acid is the simplest and most convenient way to treat the stone surface, which is the most suitable way to treat the surface stains.