1. separation: separate gold from cinnabar to avoid further contact, so as to avoid more chemical reactions.
2. Cleaning: gently clean the gold surface with mild soapy water and professional gold cleaner to remove residual cinnabar or other dirt.
3. Confirm the reason: Find out the reason why gold turns black, which is that some components in cinnabar react with gold and change color. Avoid similar situations from happening again.
4. Seek professional help: the problem of gold discoloration cannot be solved by itself, and seek the help of professional jewelry stores or gold jewelry processing units.
Gold is a stable precious metal at room temperature and will not rust due to oxidation. When gold comes into contact with some chemicals, a chemical reaction will occur, which will cause its surface to change color. Cinnabar is a kind of ore containing mercury, in which mercury reacts with the surface of gold, resulting in the blackening of gold.