An alloy formerly used for coinage, containing gold or silver with a predominating amount of copper or other base metal.
- The falling value of the Scottish currency derived in part from the practice of mixing silver with alloy to produce the base metal billon.
- Large quantities of billon coins were produced in the Roman era, many with a silver wash, and in mediaeval times throughout Europe.
- Numismatists of the 19th century, realizing the problems caused by the gaps in their knowledge, invented an arbitrary scale to refer to the bronze and billon coins of the period.
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