1. 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, bromination test 1, put the gold products into alcohol solution and shake 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, the magnet test 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 your product is attracted by magnets, it is enough to prove that this product is not gold. But you can't prove that your product is gold just because you don'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 your product is gold. The higher the density, the higher the purity of gold. Please make sure that there are no gems on your product. 1. If you don't have this equipment, the jewelry store can usually give you a density test. 2. You can put your gold products into a container filled with water, then measure the volume of spilled water, and then divide it by the weight of your products, which is the density of your 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/ml 22K- 17.7% to17.8g/ml. Five, bite gold test Everyone has seen the movie, miners bite gold test. I also see that Olympic athletes will bite their own "gold" cards when they win the gold medal. How simple this test is. 1, take a gentle bite. 2. Check your bite marks. The deeper the bite marks, the higher the purity of gold. In fact, this test is not recommended, it will damage teeth. What's more, gold will be plated with lead, which is softer. Six, ceramic scratch test method 1, using unglazed ceramics. If you don't have this, you can go to a ceramic shop to buy it. 2. Scrape your gold products with ceramics. If it is a black scratch, it means that your product is not gold. If it is a golden scratch, it means that your product is golden.