Chemical traffic light: green, yellow, red and green again) The chemical traffic light is a stunning colorful reaction! The experiment involves changing colors with an indicator – indigo carmine in an alkaline solution of glucose. The alkaline solution of glucose is poured into a solution of indigo carmine, and we observe a gradual change of color: blue – green – red – yellow. We can reverse the reaction simply by shaking the solution. The indigo carmine is oxidized by the oxygen in the air and
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