"Iron is a transition metal and it can have different oxidised states, " explained Prof Grotzinger.

BBC: Nasa's Curiosity Mars rover to ingest drill sample soon

The renowned oxidised copper plate dome was created by Madame Tussauds, originally to house its London Planetarium show.

BBC: Aardman Animation's Stardome for Madame Tussauds London

Then the leaves are rolled to bruise them, chopped, oxidised and slow-dried before being blended into Classic Tea, Afternoon Tea, Earl Grey and Green Tea.

BBC: Twenty tastes of Britain

In actuality, Cruzcampo is an ordinary mass-produced lager, tasting slightly oxidised and having a faintly sweet yellow apple note, neither of which are appealing or refreshing.

FORBES: Ice Cold in Sevilla