1, if only the surface is stained with dirt, it can be cleaned by ultrasonic instrument, but if it is a chemical reaction caused by contact with chemicals, it must be taken to the gold shop master for professional cleaning.

2. If a black film is found on the surface of the gold necklace, you can put the necklace into an aqueous solution of 2g salt, 7g baking soda, 8g bleaching powder and 60ml water to clean it.

Step 3 wash the gold necklace. You can also put it in a bowl, pour the cleaning agent, soak it for 2 hours, take it out, rinse it with clear water (preferably not hard water), bury it in sawdust to dry, and finally wipe it with a soft cloth.

Wiping the gold necklace with a cleaning agent mixed with salt and vinegar can restore it as new, which is also a way to clean the gold necklace.

Extended data:

Gold is a simple form of chemical element gold (chemical element symbol Au), which is a soft, golden yellow and corrosion-resistant precious metal. Gold is a rarer, more precious and more valuable metal. Generally speaking, the gold in the world is in ounces. In ancient China, gold was measured in ounces, which was a very important metal. It is not only a special currency for reserve and investment, but also an important material for jewelry industry, electronics industry, modern communication and aerospace industry.

The chemical symbol of gold is Au, and the financial English code is XAU or gold. The name Au comes from a story of Aurora, the goddess of dawn in Roman mythology, which means shining dawn.

After the international gold price entered 20 15, it soared all the way. The gold price in new york market rose from $0/200 per ounce to $0/300 per ounce in less than a month. Statistics show that since 20 15, the price of gold futures in new york market has increased by 9.3%.

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