The reason why the outdoor stone slab carving wall becomes black

There are many reasons for the blackening of outdoor slate carved walls. The following are a brief summary of a few points:

1. Weather factors: slate carved walls are exposed to wind, sun and rain. Erosion, especially in humid environments, the growth of bacteria and algae will promote corrosion of the stone surface, and over time, the surface of the stone wall will turn black.

2. Air pollution: The erosion of the surface of stone walls by pollutants in the air cannot be underestimated. For example, acidic gases such as sulfur dioxide and nitrogen oxides can easily cause corrosion and discoloration on the stone surface.

3. Plant growth: Various small plants often breed on the surface of stone walls. In the long-term growth, they will hinder the breathing and drainage of the wall, causing pollution and discoloration of the stone surface.

4. Material quality: Some inferior stones or improper wall protection can easily cause the surface of the stone wall to show various abnormal colors, such as black, white, mottled, etc. This phenomenon may also cause the wall to be damaged. fragility and vulnerability of the body.

In response to the above problems, we should take corresponding measures, such as regularly cleaning and maintaining stone walls, selecting high-quality materials, timely anti-corrosion protection and surface treatment of stone walls, etc. Only in this way can the beauty and longevity of the wall be guaranteed.