Analysis of information sources in references of the Wikipedia article "Tael" in English language version.
The standard ingot of China weighs about 50 taels (from 49 to 54) and, formerly called ting 鋌, is now called pao 寶 (jewel, article of value, as in the inscription on the copper cash tung-pao 通寶 = "current coin") and more commonly yuan-pao 元