《汉书·食货志》载:“今半两钱法重四铢,而奸或盗摩钱质而取铬(yu),钱益轻薄而物贵,则远方用币烦费不省。”“有司言三铢钱轻,轻钱易作奸诈,乃更请郡国铸五铢钱,周郭其质,令不可得摩取铬。”看来当时确有磨半两钱取铜的现象,更铸有廓的五铢钱,主要目的是防止磨钱取铜。从出土的半两钱上看,确有一些被挫磨过,但是被剪凿磨边的“四铢半两”钱却极少发现。南宋洪遵《泉志》载:“李孝美日,张台说,半两之品甚众,有传形者,有肉郭者,有对文者,有隐起字者。”清翁树培《古泉汇考》中说:“对文五铢,顾煊日剪凿取其郭者,义欤。然今半两本多 ”Han Shi Foodstuffs“ contains: ”This half of the two money method weighs four baht, and rape or theft money money and take chrome (yu), Qian Yi thin and expensive, then the remote use of the currency is not costly province There are three words of baht money Secretary light, easy money for treacherous, but also invited the country to cast five baht money, Zhou Guo quality, so not available to take chromium. “ The phenomenon of copper, cast more money five baht profile, the main purpose is to prevent the money from taking copper. Some half of the money unearthed from the point of view, there are indeed some frustrated, but was cut and edged ”four baht two and a half “ money is rarely found. Southern Song Dynasty Hongzun ”Spring“ contains: ”Li Xiaomei Japan, Zhang Tai said that half of the two products are very popular, there are precepts, there are Rou Guo, who have the right to writers, hidden characters.“ Weng Shu-pei, ”Spring Fountain test,“ said: ”The text of the five baht, Gu Qiu day cut chisel to take its Guo, Yi Zhi.