First, visual inspection.

1, check the official symbol of gold. Generally 999 or 990, or 10K, 18K, 22K, 24K. Anything below 10K is not considered, because the gold content is too low. If you look at it with a magnifying glass, you will see it more carefully.

2. Ancient gold ornaments will not have obvious official purity marks.

3. Of course, fake gold ornaments will also have official marks, so further inspection is needed.

4. Look for obvious discoloration. Check the worn area of the gold surface, usually at the edge of the gold product, and check the discoloration there. If the gold gradually disappears and becomes another color, then the product is only gilded.

Second, the bromine chemical test

1, put the gold product into the alcohol solution and shake it for a while.

2. Soak a piece of filter paper in alcohol solution.

3. At this time, the filter paper becomes grayish purple.

4. Drop 4 drops of bromine-a reagent on the filter paper. If the filter paper turns white, then this gold product is real gold.

All tests take 20 minutes.

Third, magnet testing.

This is a simple test, but it is not a sufficient proof to prove whether it is real gold. You can find a powerful magnet to do the test.

Gold is not a magnetic metal. If the product is attracted by a magnet, it is enough to prove that the product is not gold. But it can't be proved that the product is gold just because it doesn't respond to magnets, because there are many non-magnetic metals.

4. Density test Only a few metals have higher density than gold. The density of pure 24K gold is about 19.3g/ml, which is much higher than other metals. The density test method is enough to prove that the product is gold. The higher the density, the higher the purity of gold. Please make sure there are no gems on the product.

1, if there is no such equipment, jewelry stores can generally do density testing.

2. You can put gold products into a container full of water, and then measure the volume of spilled water, and then divide it by the weight of the products, which is the density of gold products. Remember, different gold purities have different g/ml ratios:14k–12.9? 14.6g/ml 18k gold-15.2 to 15.9g/ml 18K platinum-14.7? 16.9g/ml22k-17.7%% to 17.8g/ml.

Verb (verb abbreviation) bite test

Miners bite gold to test it. Olympic athletes must bite the "gold" card when they win the gold medal. How simple this test is.

1, take a gentle bite.

2. Check the bite marks. The deeper the bite marks, the higher the purity of gold.

In fact, it is not recommended to do this test, which will damage the teeth. What's more, gold will be plated with lead, which is softer.

Six, ceramic scratch test method

1. Use unglazed ceramics. If you don't have this, you can go to a ceramic shop to buy it.

2. Scrape gold products with ceramics. If it is a black scratch, it means that the product is not gold. If it is a golden scratch, it means that the product is golden.