Euro coins edge of the €2 coin also protects it from counterfeiting. Euro coins were designed in cooperation with organisations representing blind persons, and as a result they incorporate many features allowing them to be distinguished by touch alone. In addition, their visual appearance is designed to make them easy to tell apart for persons who cannot read the inscriptions on the coins. The coins increase in size and weight with value. Of the eight denominations of euro coins, the three lowest denominations are small, resemble copper in colour and are quite thin and light. The next three denominations resemble gold in
Cash (Chinese coin) are: Trial coins with "Fujian Sheng Zao" (), "Min Sheng Tong Yong" (), and a "Fujian Tong Bao" with a reverse inscribed with "Er Wen Sheng Zao" () were also cast, but never circulated. The earliest standard denominations of cash coins were theoretically based on the weight of the coin and were as follows: The most common denominations were the ½ tael () and the 5 zhū () coins, the latter being the most common coin denomination in Chinese history. From the Zhou to the Tang dynasty the word "quán" (泉) was commonly used to refer to cash coins however