What should I do if potassium permanganate yellows the tiles?

1. Add a little pear juice to the polluted place, which contains vc, and use the redox reaction of potassium permanganate and vc to see if it can be decolorized;

2. It can also be soaked in citric acid or 2% oxalic acid aqueous solution, and the stain can be removed through chemical reaction.

3. The key is the maintenance of the tile itself. Sealing the pores on the surface of the tile to prevent the infiltration of colored pollutants can keep the tile from getting dirty. At present, there is a new patented technology product that can seal the pores on the surface of ceramic tiles. You can try it.