One of the mysteries of the English language finally explained.
An alkaline solution of copper(II) sulphate and a tartrate, used in a laboratory test for sugars.
- ‘The galactomannan was obtained from the alkali-soluble fraction by selective precipitation (Fehling's reagent).’
- ‘Fructose gives a positive test with Fehling's solution too.’
- ‘Some are remembered by association with useful substances, like Fehling's solution, or Glauber's salt.’
Late 19th century: named after the German chemist Hermann von Fehling (1812–85).
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