Copper sulphate, for instance, known as Bordeaux mixture, was invented in the 19th century for vineyards, and widely used until 1930.

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Remember those chemistry lessons spent sticking electrodes into copper sulphate solution?

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The lutetium oxide from which the crystals are made (in only a slightly updated process from the way we all made copper sulphate crystals in high school chemistry classes) all came from China.

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