The method of identifying pure silver-"density"+"heat conduction" is simple and easy to operate, which can ensure the correctness. The density of pure silver is10.5g/ml. You can identify the authenticity of silver coins by measuring the density, and measure the density by buoyancy method, which is relatively simple and can be measured at home. As long as there is a scale or balance with high accuracy (such as jewelry scale), first weigh the mass of silver coins in the air, and then weigh their mass in the water. The difference between the two, if the mass in the air is divided by the difference, is the density of silver coins. If the result is 10.5, the density is consistent. The density of copper in metal is 8.9, and that of steel is about 7.9, which is higher than that of silver, including lead 1 1.4, and it is relatively easy to distinguish. Unless two or more metals are mixed together, their density can be the same as that of silver. In this case, we can do the following experiments, because silver in metal has the best thermal conductivity, that is, the highest thermal conductivity, and other materials, especially alloys, are very poor. You can take some hot water of about 80 degrees, immerse one third of the silver coin in the hot water, and hold the upper end of the silver coin in your hand. If it takes about 10 second, you will find the heat unbearable, which means it is real silver. Silver coins to be identified can also be compared with known pure silver or iron materials, which is easy to distinguish.