How to distinguish true and false gold? Summary of the simplest practical tips for distinguishing true and false gold
4hw.com.cn: gold is an investment means in recent years. No matter what the currency price on the market, gold's status as a global currency is unshakable. Many friends may not know how to distinguish the true and false of gold. Here are some ways to identify gold!
1、 Visual inspection
1. Check the official logo of gold. They are generally engraved with 999 or 990, or 10K, 18K, 22K, 24K. Do not consider less than 10k, because the content of gold is too low. If you look with a magnifying glass, you will look more carefully.
2. Ancient gold jewelry will not have an obvious official purity mark.
3. Of course, fake gold jewelry will also have official signs, so it needs further inspection.
4. Look for obvious discoloration. Check the wear 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 becomes another color, the product is only a gold plating.
2、 Bromine chemistry test
1. Shake the gold product in an alcoholic solution for a while.
2. Soak a piece of filter paper with alcohol solution.
3. At this time, the filter paper turns gray 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 full test time takes 20 minutes.
3、 Magnet test
This is a simple test, but it is not a sufficient proof of 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 a magnet, it is enough to prove that the product is not gold. But you can't prove that your product is gold because it doesn't respond to magnets, because there are many non-magnetic metals.
4、 The density test shows that only a few metals are more dense than gold. The density of pure 24K gold is about 19.3 g / ml, which is much higher than that of 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 there are no gems attached to your product.
1. If you don't have this 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 then divide it by the weight you weigh, which is the density of your gold product. Remember, different gold purity has different G / ml ratio: 14k & ndash; 12.9〜 14.6 g / ml 18K gold - 15.2 to 15.9 g / ml 18K platinum - 14.7〜 16.9 g / ml 22K - 17.7% to 17.8 g / ml.
5、 Bite test
We've all seen movies where miners bite gold to test it. We also see how easy it is for Olympic athletes to bite their 'gold' medal when they win a gold medal.
1. Take a gentle bite.
2. Check your bite marks. The deeper the bite marks, the higher the purity of gold.
In fact, this is not a recommended test, which will damage your teeth. What's more, gold will be plated with lead. Lead is softer.
6、 Ceramic scratch test method
1. Use unglazed ceramics. If you don't have this, you can buy it from the 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.