Many people like to buy and collect gold, but there are a lot of fake gold on the market. These fakes not only make themselves lose money, but some jewelry is also doped with other substances. Wearing them for a long time will affect your health. In order to help consumers identify the true and false of gold, CCTV's ten sets of "The Original" are in the "Golden True and False", applying scientific methods to help people find a good way to identify real gold.
Gold is one of the most wonderful metals in the world. Its chemical symbol Au is derived from the Latin dynasty word, meaning Twilight. The total gold reserves on the earth are about 4.8 billion tons, of which 99.7% are in the earth. In the nuclear and mantle, it can never be mined, and the rest is distributed in the earth's crust and sea water. More than 90% of them are difficult to extract. Therefore, the gold that humans can get is very limited and the price is very expensive. Therefore, any point of gold price Fluctuations will cause great concern to consumers. In order to test the true and false of gold, the public also summed up a number of methods. These well-known test methods are not reliable. The original experiment shows that the rumors have scientific basis.
Biting with a tooth, there must be a bite mark
1 At the scene of the show, a guest bite a piece of gold, copper and silver with his teeth, leaving obvious teeth biting on all three substances.
2 Truth: In the experiment, the hardness of the three substances was used. The world's hardest solid material diamond has a Mohs hardness of 10, a human tooth has a Mohs hardness of 6-7, and a relative Mohs hardness of gold and silver is 2.5-3 is 3, pure copper, so the hardness of many metal materials They are all relatively low, and biting with a bite will leave a noticeable bite.
3 Conclusion: Using dental bites to distinguish which is gold and which is not gold, there is no scientific basis.
Look at the color, the more yellow the more pure
1 There are many necklaces on the scene. The guests think that the yellowest color is the real gold necklace.
2 Truth: Use a touchstone to detect which necklace is true. The result shows that the color of the real gold necklace has no other fake color yellow.
3 Conclusion: The touchstone is a siliceous rock with a black color. Draw some gold streaks on the touchstone, then drop the nitric acid. If there is no change in the gold streaks, it is true gold, because gold is insoluble in nitric acid. Experts say that golden yellow is the inherent physical property of gold. Under the condition of no analysis and testing, it is not feasible to visually distinguish color from the naked eye. Because gold can add other elements and change the color, there is no scientific basis for this identification method.
掂 weight, the deeper the better
1 On-site, the host asked the guests to use the weight of the singularity to identify the true and false of the four different jewels. Everyone agreed that the lightest jewellery is fake gold, and the most heavy hand is true gold.
2 Truth: The result of testing with professional instruments is that the guests agree that the lightest gold jewellery is real gold, and the heaviest hand is fake, all copper.
3 Conclusion: The specific gravity of gold is about 19.32 grams per cubic centimeter, and the specific gravity of silver is about 10.5 grams per cubic centimeter. If both materials are 1 kilogram, the volume of silver will be about twice that of gold, but the density of gold. Be higher. Experts say that the gold content requires a lot of preconditions. For example, the size, appearance and shape of gold jewelry are similar. The amount of enamel needs some experience. For example, people who can access gold products every day, the best way is to use professional instruments. It is measured, so it is not feasible to distinguish the true and false components.
With fire, no change
1 In a gold and silver jewelry processing factory, burn gold with a gun with a temperature of more than 1,000 degrees. The real gold is burning more and brighter, and the fake gold is burnt black. Then, a pile of gold was completely melted in a professional container to make a gold nugget, to see how the weight of gold before and after melting changed. The results showed that the weight of the gold jewelry did not change after it became a gold bar.
2 Truth: The melting point of gold is about 1064 degrees Celsius. When the flame reaches or exceeds this temperature, the gold will become liquid. Experts say that real gold is not afraid of fire. The original meaning is that pure gold will not oxidize under high temperature conditions, and color and weight will not change. If it is not pure gold, color and weight will change after burning with fire. .
3 Conclusion: It is scientifically reasonable to use the method of burning gold to distinguish true gold. However, for ordinary consumers, experts do not advocate using such a method, because it is dangerous to burn gold with more than one thousand degrees of temperature. Therefore, this method is not the best way to distinguish between true and false.
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