Marble is widely used in modern buildings. It is easy to whiten after a long time or after grinding, and the surface loses its luster. What causes the marble to be white and dull?

1. Insufficient grinding optimization
   The primary reason for the whiteness of black stone: the grinding is not well ground. When grinding black stone, it is forbidden to skip the number. If the number is skipped, the next-level grinding plate cannot suppress the scratches left by the previous-level grinding plate, and it will inevitably turn white.

2. black stone can not cover scratches
   No matter what kind of scratches on the stone, they are all white. In daily life, from scratches on the protective film of mobile phones to scratches on cars of various colors, they are all white without exception. This phenomenon It is determined by optical principles and has nothing to do with material and color. The ability of black stone to hide scratches is the lowest, grinding scratches, scratches caused by polishing coarse particles, and scratches caused by sole grit, all of which make black stone gray and white.

3. Black stone is easy to be polluted
   Black is a color with strong contrast, dust, stains, pollution, these are easy to show on the black stone, causing the vision to be gray and white.
   

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