The machine blends iron, bleach and sodium hydroxide to form a dark purple liquid mixture of ferrate, salt and water that gets metered into the water supply. (The color disappears instantly as it reacts with the water.) Common disinfectants ozone and chlorine can turn the water cloudy or, worse, leave behind harmful chemical by-products.

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The result is, in effect, a liquid sponge, and means the mixture can be stored indefinitely, like ordinary diesel, without risk of separation.

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The process, which converts a mixture of hydrogen and carbon monoxide to liquid fuels, and was discovered by German scientists.

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There were no eggs in the ice cream itself, but the mixture was transported in lorries that had previously carried liquid eggs.

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Returning the superheated mixture suddenly to atmospheric pressure causes it to separate into its liquid and gaseous components.

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Blitz the orange juice, anchovy, capers and garlic in a food processor and then stir the resulting liquid, along with the olive oil, into the olive-date mixture.

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His idea: a better molten salt mixture that would store heat at higher temperatures to boost electricity production but that would remain liquid at lower temperatures so less energy would be diverted to keep it from solidifying.

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