Why can silicone sleeves be yellow?

The widely seen silicone case means that silicone phone cases are more common, and yellowing is the essence of general silicone products. 

Usually, products undergo natural environmental changes after a long period of use, and yellowing occurs. 

However, adding anti yellowing agents from the text can exceed the condition of not changing yellowing, or using food grade silicone materials and liquid-phase silicone materials, High transparency, high tensile strength, and high-quality silicone materials themselves are not prone to yellowing. 

Therefore, the product you purchased belongs to general silicone and the absence of anti yellowing agents can cause the product to turn yellow. 

Therefore, when purchasing silicone sleeves, everyone does not need to be greedy for cheap prices.

 The price of the product depends on its quality.