The gold necklace is worn around the neck, and the neck is often sweated. The sweat and the gold jewelry will produce a chemical reaction, produce silver chloride and copper sulfide, and show dark black. This chemical reaction often falls from gold jewelry, so that the wearer's skin's skin Leave obvious black stains. The is another reason. Some friends like to apply cosmetics on the stomach. Some cosmetics contain fine hard particles. It can form another type of dirt, thereby wear gold jewelry and darkens.
The gold necklace is worn around the neck, and the neck is often sweated. The sweat and the gold jewelry will produce a chemical reaction, produce silver chloride and copper sulfide, and show dark black. This chemical reaction often falls from gold jewelry, so that the wearer's skin's skin Leave obvious black stains.
The is another reason. Some friends like to apply cosmetics on the stomach. Some cosmetics contain fine hard particles. It can form another type of dirt, thereby wear gold jewelry and darkens.