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.
Model release not required. Property release not required.