Gold jewelry is placed in a sulfur environment for a long time, and there may be red spots on the surface. In addition, when gold jewelry is in contact with acid, there may also be red spots. This is due to the result of the oxidation layer on the surface of the jewelry on the surface of the jewelry. The people in this regard can pay attention to Zhongqi Gold WeChat
Gold jewelry is placed in a sulfur environment for a long time, and there may be red spots on the surface. In addition, when gold jewelry is in contact with acid, there may also be red spots. This is due to the result of the oxidation layer on the surface of the jewelry on the surface of the jewelry.
The people in this regard can pay attention to Zhongqi Gold WeChat