 During the late Qing dynasty under the reign of the Guangxu Emperor in the mid 19th century the first machine-struck cash coins were produced, from 1889 a machine operated mint in Guangzhou, Guangdong province opened where the majority of the machine-struck cash would be produced.Machine-made cash coins tend to be made from brass rather than from more pure copper as cast coins often were, and later the copper content of the alloy decreased while cheaper metals like lead and tin were used in larger quantities giving the coins a yellowish tint.Another effect of the contemporary copper shortages was that the Qing government started importing Korean 5 fun coins and overstruck them with "10 cash".