Distinguish between true and false gold
1. Look at the color: Many people know that according to the color of gold, it can be divided into pure gold, k gold, real gold and fake gold. Generally speaking, pure gold with purity above 95% can be called pure gold; If the fineness of yellow is about 80%, it is called real gold; The fineness of yellow is about 70%, which is called K gold. Yellow is slightly gray, with a fineness of about 50%, which can be called fake gold.
2. Look at the weight: gold is about twice as big as silver, and lead is the same volume. Holding real gold, copper or other things in your hand only makes you feel heavy, not depressed.
3. Listen to the sound: Generally speaking, when real gold is thrown, it will make a dull and low "bang, bang" sound. There is sound, no rhyme and no elasticity. K gold has rhyme, sound and elasticity. The greater the elasticity, the sharper the rhyme and the longer the quality. The sound of fake gold usually produces a "contemporary" sound, with a lingering sound, which is violently defeated after landing.
4. Folding hardness: Real pure gold is marked with sharp things. If you want to bend, it is not easy to break through, and fake or low-quality gold is easy to break.
1. Gold is the elemental form of chemical element gold (chemical element symbol Au). It is a soft, golden yellow and corrosion-resistant precious metal. Gold is a rare, more precious and more valuable metal. Gold is generally expressed in ounces internationally.
2. In ancient China, "Liang" was used as the unit of gold. This is a very important metal. It is not only a special currency for reserve and investment, but also an important material for jewelry industry, electronics industry, modern communication, aerospace industry and other departments.
3. The chemical symbol of gold is AU, and the financial English code is XAU or gold. The name AU comes from a story of the goddess of dawn in Roman mythology, which means shining dawn.
4./kloc-Before 0/9th century, the level of gold productivity in human society was very low. Some studies believe that in the thousands of years before the19th century, human beings produced less than 10000 tons of gold, for example, in the18th century, gold was only 200 tons.
5. Since a series of gold resources were discovered in19th century, the gold output has been greatly improved. Especially in the 50 years in the second half of the19th century, the gold output exceeded the previous total of 5,000 years. In 20 13, the total output of gold medals in the world was about 2770 tons.