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Boron: Boric Oxide Reduced with Magnesium Filings (Moissan, Thorpe 1912)
Magnesium tears the oxygen out of boric oxide at red heat. Acids then wash away everything that is not boron.
Result: chestnut-brown boron powder, nearly pure; a trace of magnesium boride stays.
Source: Thorpe, Dictionary of Applied Chemistry vol. 1 (1912), p. 498, after Moissan (Thorpe: 'the best method'). Not given: the furnace and acid strengths. Picture drawn by Youblob.
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