A lot of people have such a question, why does the mirror turn black?
In fact, the cause of the mirror blackening is because the silver layer of the mirror has been oxidized and blackened by the oxidation of the electrolyte.
1. The sweat of the human body (salt)
2, the trace acid gas in the air (carbon dioxide, sulfur dioxide)
3, in the decoration of other decoration materials brought by pollutants, such as: silicone rubber (glass glue), unclean water and so on.
4. Daily chemicals (containing metal ions, surfactants, and their systems are generally acid or alkaline.
5. The water soluble salts of concrete (the alkali segregation of concrete)