Does the subject want to ask, "What if the gold is burned black with a lighter and cannot be erased?" If gold can't be wiped off after being blackened with a lighter, you can try the following methods:

1. Use metal cleaning solution. Soak the gold jewelry in the metal cleaning solution, follow the instructions in the manual, and then rinse it with clear water.

2. Use toothpaste and a soft toothbrush. Squeeze a proper amount of toothpaste on a soft toothbrush, gently scrub the surface of gold jewelry, and then rinse it with clear water.

3. Use professional gold cleaner. You can buy professional gold cleaning agents in jewelry stores or online.

Gold is a soft metal, which is easy to be scratched and deformed. Therefore, in the cleaning process, handle it with care, and avoid using too rough tools or using too much force. If there are inlaid gems or other materials on the surface of gold ornaments, be careful not to damage these parts.