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For more on marking an answer as the "Best Answer", please visit our FAQ.Freezing of foods was achieved by mixing salt with ice. Mixing salt with ice reduces the freezing point and it is quite easy to achieve temperatures lower than -14�C. Just who discovered the process is unknown but it was probably invented by the Chinese. It was written about in India in the 4th century, and the first technical description of ice making using various salts was by an Arab medical historian Ibn Abu Usaybi (A.D. 1230-1270).
But the process did not arrive in Europe until 1503, in Italy. It was considered a chemists party trick, using various acids, water and salts. However it was not used for food until water ices (sorbets) appeared in the 1660's in Naples, Florence, Paris and Spain. Later in 1664 ices made with sweetened milk first appeared in Naples.
Your Mum might find this interesting as well - the rest is in the link:
Freezing of foods was achieved by mixing salt with ice. Mixing salt with ice reduces the freezing point and it is quite easy to achieve temperatures lower than -14�C. Just who discovered the process is unknown but it was probably invented by the Chinese.
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