In the fourth year of Yuanshou (BC 1 19), facing the prevalence of "three baht" money to lose weight and private casting, Emperor Wu of the Han Dynasty made two kinds of "imported" coins, "Pibi" and "Platinum Tri-product", in order to prevent private casting. Leather coins are made of white deerskin, and platinum is made of silver-lead alloy. Because both are virtual currencies, the number of banks is very limited, so it stopped in a short time, and then it was connected with the five baht money of the county and country introduced earlier. However, these two currencies are special. Although it is not confirmed whether the physical objects exist in the world, they are also introduced to the vast number of Tibetan friends as an extension of knowledge. According to Historical Records, money is frivolous and expensive because of rape or theft, so it is troublesome to use money far away. It's a foot square of white deerskin, with seaweed on the side (one is purple), and it's a leather coin, straight 400 thousand. A royal pilgrimage, to recommend jade with leather coins, and then it's done. That is to say, in the fourth year of Yuanshou (1 19 BC), people who made profits by grinding copper coins prevailed, which led to the increase in the price of money and the low credibility of far coins. So the square foot (23 cm square) of white deerskin in the palace garden was used as leather coins, worth 403,000 baht, or 40 kilograms of gold, belonging to the royal family. In fact, the purpose of Liang Wudi's making "magic" is to collect the upper class aristocrats such as princes and clans, and exchange the imaginary "magic" for the gold, silver and copper coins of princes and clans. Because the face value of "Pibi" is too large, it does not involve ordinary people at all. ★ "Platinum Tri-products" and "Pibi" with a value of 400,000 yuan appeared at the same time, as well as "Platinum Tri-products". According to historical records, "the county magistrate was ordered to sell half a tael of money and cast three baht of money, which is as heavy as a book (twenty-four baht is one tael, that is, 1.95g)" and announced that "all the crimes of stealing casting money are dead", but there are still countless thieves. So he made silver, tin and platinum, among which platinum is divided into three categories: one is eight taels, and the other is Long Wen, named Bai Xuan, with a value of three thousand (meaning three thousand baht); Second, the weight difference is small and square, and its wenma value is 500; The third is complex and small, oval, and its tortoise is worth 300. "And it is forbidden to steal casting, offenders will be put to death. In other words, the so-called white gold coin is a kind of silver-tin alloy coin, which has three varieties. One is the "dragon coin", which was eight or two times (192 baht) according to the weight system at that time, and it was worth 3000 baht at that time, so it was called "white selection". The second type is "Malaysian coin", which weighs six taels (144 baht) and is worth five hundred taels. The third type is an oval coin with turtle pattern, which weighs four taels (96 baht) and is worth 300 taels. In fact, the "three platinum products" were exploited by Emperor Wu of the Han Dynasty, and a large number of virtual coins were exchanged for real copper coins of big businessmen. Ordinary people don't have so many copper coins to exchange for "platinum", so they won't be affected. But to the surprise of Emperor Wu of the Han Dynasty, because the price difference between "platinum" and copper coins is too wide, although it is expressly stipulated that casting thieves is a capital crime, the profits are too great, and many officials and people take risks and steal casting. There are so many criminals that the government can't kill them all. There is no way. After casting for three years, Emperor Wu of the Han Dynasty was forced to give up the "three platinum products" in two years (BC 1 15). At this point, the coins of the Han Dynasty and the New Dynasty were introduced. It can be seen that coins accurately reflect the politics, economy and culture at that time, which is the charm of coin collection.