1. Check the official logo of gold. It is generally engraved with 999 or 990, or 10K, 18K, 22K, 24K. Don't consider less than 10k, because the content of gold is too low. If you look with a magnifying glass, you will see more carefully
2. Ancient gold jewelry will not have obvious official purity marks
3. Of course, fake gold ornaments also have official marks, so further inspection is required
4. Look for obvious discoloration. Check the worn area on the gold surface, usually at the edge of the gold product, and check the discoloration there. If the gold color gradually disappears and turns into another color, then the product is only a gold plating
2. Bromine chemistry test
1. Put the gold product into the alcohol solution and shake it for a while
2. Soak a piece of filter paper with alcohol solution
3. At this time, the filter paper turns grey purple
4. Drop 4 drops of bromine-a reagent onto the filter paper. If the filter paper turns white, the gold product is real gold
the total test time is 20 minutes
3. 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 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 it doesn't react to magnets, because there are many non-magnetic metals
IV. density test: only a few metals have a density higher than that of gold. The density of pure 24K gold is about 19.3g/ml, which is much higher than other metals. The density test is enough to prove that your product is gold. The higher the density, the higher the purity of gold. Please make sure your product has no gems attached
1. If you don't have such equipment, jewelry stores can usually do density tests for you
2. You can put your gold product into a container full of water, then test the volume of overflowing water, and divide it by the weight of the product you weigh to get the density of your gold product. Please remember that different gold purity has different ratios of g / ml: 14k – 12.9 ~ 14.6 g / ml 18K gold - 15.2 ~ 15.9 g / ml 18K platinum - 14.7 ~ 16.9 g / ml 22K - 17.7% to 17.8 g / ml
v. biting test
everyone has seen the film. The miner bites gold to test it. We can also see how easy it is for Olympic athletes to bite their "gold" medals when they win gold medals
1. Take a bite
2. Check your bite marks. If the bite marks are deeper, the purity of gold will be higher
in fact, this is not a recommended test, which will damage your teeth. What's more, gold will be plated with lead, which is softer
VI. ceramic scratch test
1. Use unglazed ceramics. If you don't have this, you can buy it from a ceramic shop
2. Scratch your gold product with ceramics. If it is a black scratch, it means that your product is not gold. If it is a gold scratch, it means that your product is gold.
1、 Visual inspection
1. Check the official logo of gold. It is generally engraved with 999 or 990, or 10K, 18K, 22K, 24K. Don't consider less than 10k, because the content of gold is too low. If you look with a magnifying glass, you will see more carefully
2. Ancient gold jewelry will not have obvious official purity marks
3. Of course, fake gold ornaments also have official marks, so further inspection is required
4. Look for obvious discoloration. Check the worn area on the gold surface, usually at the edge of the gold product, and check the discoloration there. If the gold color gradually disappears and turns into another color, then the product is only a gold plating
2. Bromine chemistry test
1. Put the gold product into the alcohol solution and shake it for a while
2. Soak a piece of filter paper with alcohol solution
3. At this time, the filter paper turns grey purple
4. Drop 4 drops of bromine-a reagent onto the filter paper. If the filter paper turns white, the gold product is real gold
the total test time is 20 minutes
3. 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 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 it doesn't react to magnets, because there are many non-magnetic metals
IV. density test: only a few metals have a density higher than that of gold. The density of pure 24K gold is about 19.3g/ml, which is much higher than other metals. The density test is enough to prove that your product is gold. The higher the density, the higher the purity of gold. Please make sure your product has no gems attached
1. If you don't have such equipment, jewelry stores can usually do density tests for you
2. You can put your gold product into a container full of water, then test the volume of overflowing water, and divide it by the weight of the product you weigh to get the density of your gold product. Please remember that different gold purity has different ratios of g / ml: 14k – 12.9 ~ 14.6 g / ml 18K gold - 15.2 ~ 15.9 g / ml 18K platinum - 14.7 ~ 16.9 g / ml 22K - 17.7% to 17.8 g / ml
v. biting test
everyone has seen the film. The miner bites gold to test it. We can also see how easy it is for Olympic athletes to bite their "gold" medals when they win gold medals
1. Take a bite
2. Check your bite marks. If the bite marks are deeper, the purity of gold will be higher
in fact, this is not a recommended test, which will damage your teeth. What's more, gold will be plated with lead, which is softer
VI. ceramic scratch test
1. Use unglazed ceramics. If you don't have this, you can buy it from a ceramic shop
2. Scratch your gold product with ceramics. If it is a black scratch, it means that your product is not gold. If it is a gold scratch, it means that your product is gold.
The value of gold lies in its purity
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