This problem just proves that the purity of the silver comb you bought is high, because the chemical properties of silver are very active. When it meets oxygen and sulfur in the air, silver will be oxidized and vulcanized. It will turn yellow after oxidation and turn black after vulcanization.

It is normal for silver to turn yellow and black, but it proves that the purity of silver is very high.

This answer is provided by the planning department of Hunan Chen Zhi Jewelry Co., Ltd.. I hope I can help you. Thank you!