Red copper oxidation method: 1. Soak one end of the solution and connect the other end of the cable; Taking another more plastic metal than copper, immersing it in the same aqueous solution, connecting one end of the cable, and finally plugging in two cable ends can achieve the actual effect of rapid oxidation. 2. Heating copper will form copper oxide, and if the ambient temperature is very high at this time, in a continuous high temperature environment, copper oxide will be converted into cuprous oxide and O2. When heated, copper will react with oxygen in the air, forming a gray black oxidized copper. After heating, copper transforms into a bright red color, blocking O2 from heating and turning bright red. When heated in the air, it turns gray black (oxidized and turned black). 3. Insufficient thickness of gold plating or coating falling off, oxidation at high temperatures, or long storage time of inserts or long pre drying time of inserts, in addition to atmospheric humidity, surface pollution, and impurities and vapors in the natural environment can cause red copper oxidation.

Reason for oxidation of red copper: 1. It is possible that the red copper inlay is not thoroughly cleaned before gold plating, and black scratches will appear on the surface, which is a cuprous salt produced after losing one electron due to oxidation. 2. It is also possible that the cleaning was not carried out in a timely and complete manner, or the processing technology was poor. Residual water stains, cleaning solution, and copper elemental elements caused electrochemical corrosion with oxygen in the air, resulting in the formation of black sub copper. In severe cases, they are all emerald green salts. 3. It may also be due to insufficient gold plating thickness or coating falling off, oxidation at high temperatures, or long storage and pre drying time of inserts. In addition, atmospheric humidity, surface pollution, and impurities and vapors in the natural environment can cause red copper oxidation.

The critical value for red copper oxidation is generally between 45% and 60% ambient humidity. Isolation of red copper from air contact: Under the same conditions, the relative content of saturated water vapor in the atmosphere is called air humidity. Below a certain air humidity, the oxidation and fading rate of red copper is relatively slow. When this air humidity is exceeded, the oxidation and fading rate will suddenly increase. This air humidity is called the critical environmental humidity. The air humidity has a significant impact on the oxidation and discoloration of red copper. When the atmospheric humidity exceeds the critical value of environmental humidity, there will be shrinkage water or water droplets on the surface of red copper.