Episode Details

I am now at the Edinburgh Fringe with Shaping the Earth, a “lecture with funny bits” about the history of mining. I’m then taking the show to London on October 9th and 10th to the Museum of Comedy. Please come if you fancy a bit of “learning and laughter”. The Edinburgh link is here. And the London link is here.

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“They don't give you gold medals for beating somebody. They give you gold medals for beating everybody.” Michael Johnson, sprinter

Why do Olympic winners bite their gold medals? The short answer is: for no other reason than a photographer just told them to. But the tradition of biting gold goes back a long way.

You might have seen pirates in movies biting their coins too. While such hard-toothed individuals might inspire excitement in modern audiences, ordinary merchants and traders, indeed anyone handling money, used to bite their coins too: it was a rude test of the purity of the metal. Prospectors in the 19th-century gold rushes also used this method to differentiate between real gold and fool’s gold? 

As well as scraping (to look for plate) or indenting to test softness, biting might involve a little bending too, using the teeth as a clamp to bend against. If the metal is soft and malleable, it was likely pure gold or silver. Hard and brittle, it could indicate that the coin was counterfeit or mixed with other metals. Too soft, however, and the coin was likely lead, coated with gold, a common counterfeit in the 19th century. (Lead is softer than gold). 

The method might expose crude forgeries, but it would by no means have been foolproof. Copper was added to gold coins from the Tudor period onwards, which would have made them harder, and the bite test that much less reliable, though in Mediaeval times biting might have worked better. Coins, such as Florence’s florin, the standard of the day, were 24 carat, thin, and relatively soft. The bite test might have exposed forgeries.

Weighing is more effective, and any merchant would have a set of scales, though perhaps not a pirate. The stamp of the issuer, ideally a reputable royal, also went a long way to certifying authenticity. 

For the prospectors of the

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