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During the 14th century, when the Czech currency was losing value due to the substitution of silver with cheaper metals, counterfeiting of money got better, despite the stringent prosecution and death penalty it entailed. One example of such counterfeiting consisted of coins that were silver plated over a lead core. This could be tested by biting the coin (since lead is softer than silver). The counterfeiters’ workshops were often hidden away in karst and sandstone caves, and featured a compact laboratory, as the silver-plating of the base metal was a chemical process requiring special equipment.

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