Fehling's reaction. Fehling's reagent (blue, left) is used to test for aldehydes, such as simple sugars. The reagent has a blue colour as it contains

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Fehling's reaction. Fehling's reagent (blue, left) is used to test for aldehydes, such as simple sugars. The reagent has a blue colour as it contains copper ions. The test tube on the right contains Fehling's reagent that has been reduced by glucose, turning the copper ions red.

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Keywords: analysing, chemical, chemistry, copper, duo, equipment, experimenting, fehlings, glucose, indicator, ion, ions, pair, precipitate, reacting, reaction, reagent, sugar, sugars, test, testing, tube, tubes