Gold has properties that are stable and not easily oxidized. However, in daily life, various household items contain various chemicals, some of which are easily attached to gold after contact with gold, such as mercury, chlorine, lead and sulfur and so on. When these chemicals are oxidized, they will discolor the gold jewelry or make the color dim. This is the common gold "rust".
Gold jewelry sometimes appear white spots, especially gold cheap custom jewelry. The appearance of white spots is most likely because women did not pay attention when using cosmetics containing mercury, resulting in long-term contact with cosmetics to produce white spots. Because when gold encounters mercury, it will react with each other to form a white "gold-mercury".
In addition, if gold products are worn at the same time as platinum and silver jewellery, their surface will also produce white spots after a long time of friction. At the same time, gold can easily turn platinum into yellow, which affects the color of platinum.
Gold jewelry is easy to turn black after contact with lead. Some cosmetics or hair dyes contain trace amounts of lead, and gold encounters lead will turn black. In particular, the sunscreen cream used by ladies who love beauty in summer has a high lead content, which is most likely to cause this phenomenon. The reaction of lead and mercury leading to discoloration of gold is called “lead-mercury reaction”, and professionals can use the jewellery processing gun to heat treatment, so that the gold name necklaces jewelry can be restored to its original form. Of course, it is best not to wear gold jewelry when applying cosmetics or dyeing hair to avoid future troubles.
The completion of the production of gold products requires a lot of complicated processes. In these complicated processes, their working environment cannot be all in a vacuum environment, so it is possible to encounter dust and impurities attached situation in the air at a certain point. These impurities continue to adhere to the gold without being tempered or pickled, and may become erythema after a period of storage, causing the gold to "rust".
For turn red gold products, the best way is to get a professional goldsmith shop to wash with dilute acid. In this way, in order to protect your gold jewelry from "rusting", we must pay attention to the following two points: