1. With a bite, do you have a bite? "After the bite of the real gold, it will leave a faint tooth mark, because the ductility of gold is very good, it is a bit soft, it is hard to be impure, and it can't bite." In daily life and TV dramas, this test gold color The approach is more common. It is understood that the Mohs hardness of the human tooth is 6, the relative Mohs hardness of gold and silver is 2.53, the pure copper is 3, and the iron is 4. Many metal materials have a low hardness, and biting with a tooth will leave a noticeable bite. "Therefore, it is not scientifically based on the bite of teeth to distinguish which is gold or gold." National senior jewelry jade experts said. 2. Look at the color, the more yellow the more pure? The so-called "seven green, eight yellow and nine five red", this is the experience of some gold collectors in the past to identify the purity of gold through color, and some even think that the color of gold is more yellow and pure. 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. 3. Is the suction stone sucking? "If the gold jewelry contains impurities, suck it with a magnet, if it can be sucked up, it means that gold has impurities." Recently, this gold discrimination method has been widely spread on the Internet. "Only iron, cobalt and nickel can be sucked up by magnets. Therefore, if gold jewelry is added with other substances, then the detection method of magnetite will not be discussed." You can try these methods. 4. The density measurement algorithm is simple and feasible So, is there a gold identification method that citizens can operate on their own? Experts suggest that the general detection can use the density measurement algorithm, which is relatively simple and easy to eliminate some of the adulterated gold. It is understood that the density of gold is 19.26 g/cm 3 to 19.37 g/cm 3 at normal temperature. Therefore, a certain amount of water can be injected into a measuring cup with higher precision, and then the gold bar is placed in water to measure the volume of new water. When the two are subtracted, the volume of the gold bar is known, and the density of the gold bar is obtained. If the density is between the standard values, then the gold bar is more likely to have a higher color, otherwise it may be adulterated. This method can eliminate most adulterated gold, but if adulterated gold is added to other metals through strict proportioning, it can not be distinguished, such as tantalum and tungsten, the specific gravity is similar to that of gold, and the weight is determined by the weight of the tantalum. from. 5. Strict testing has to find professional institutions It is reported that the most scientific way to identify gold is in the laboratory, through destructive testing or spectral analysis, and both methods require professional institutions to operate. At present, our company has sold such testing instruments for gemstone inspection. The price is between 4500-38000. The accuracy and function of the instrument are different and the price is different. Gray Color Grounding Pillowcase Earth Pillow Cover,Antibacterial Pillow Cover,Silver Fiber Earth Pillow Cover,Gray Color Grounding Pillowcase Shandong EMF New Material Technology Co., Ltd , https://www.earthingsilver.com