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ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
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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