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Silver, the shiniest and showiest of metals, is still mainly used in silverware. But it also has some surprisingly modern applications. Justin Rowlatt heads deep under the city streets to the sparkling London Silver Vaults to talk tableware and frivolities - the more traditional uses of silver.

We also hear from Dr Alan Lansdown of Imperial College, a champion of silver in medicine (except when it turns you blue), and from Prof Alan Dalton about the future role of silver in flexible touchscreens.

(Photo: Silverware on display at the London Silver Vaults. Credit: Langfords)