First of all, many people have a misunderstanding about gold, thinking that gold ornaments will never change color. Once discoloration, "rust" and "long spots" occur, they think that the gold they bought is caused by insufficient gold content. In fact, it will change color if it is left for a long time. The reason for discoloration is that pure gold and thousands of pure gold products come into contact with dust, sulfur, acidic substances, etc. Due to the storage environment and climate change, the appearance may appear "long spots", "rust" or discoloration. This is due to the oxidation of the external attachments of gold ornaments, which is very common. The fundamental reason is that the related equipment in the last production process of gold production enterprises is not clean, or it is caused by manual touch pollution. Gold may turn white because it meets mercury and forms amalgam. Thermometers, barometers, etc. Mercury is commonly used in daily life, as well as some cosmetics, medicines and fungicides. Also contains mercury. If gold ornaments touch them, gold amalgam can be formed, which will change the appearance of gold ornaments.

Second, how should gold preserve its value? After buying gold, consumers should pay attention to how to properly keep gold ornaments and gold bars. For example, consumers should pay attention to the tightness of their outer packaging when storing gold bars to ensure that the storage environment is boring and clean. Gold bars and ornaments should pay special attention to avoid conflict or long-term contact with iron and mercury.

Finally, don't worry if the gold changes color. The natural oxidation of gold appearance does not affect its color and weight. When the purchased gold ornaments and gold bars appear discolored and "long spots", the brand counters or stores that can be purchased will often be restored to their original state after simple appearance disposal (burning, cleaning, etc.). ). If it cannot be solved by external treatment, you can also consult relevant professors or be identified by national professional testing institutions, and then dispose of it under the guidance of professors according to specific conditions.