The chemical nature of gold is very stable, but there is also the possibility of discoloration and fading. Gold jewellery faded to white under acceptable conditions and may have encountered mercury. Some cosmetics contain mercury. Gold ornaments will also combine with sweat and mercury in the laundry detergent to form a mercury-gold compound. In this case, you can recover it by taking a high temperature treatment at the gold store.
As for the gold ornaments, it depends on the specific parts, if the buckle parts are normal. "Because of the requirements of the production process, the buckle needs to have a certain flexibility. Instead, it can not use thousands of gold. According to the national standard, gold with a purity of more than 900 is used. Such a buckle will be mixed with other metals, and red and black will appear. It is also normal.
For the "rusty" gold ingots, it is not uncommon for some pure gold coins and gold ingots to appear "rusty" on the surface. Mainly because gold is not cleaned during production and processing. For example, when dust and other materials are brought into the process of pressing gold bars, after storage for a period of time, oxidation occurs under conditions of contact with light, air, etc., and rust spots are formed. Professional cleaning is easy to remove.
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