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   Chemicals: glucose, sodium hydroxide, indigo

 

      Solution A: 14 g glucose in 700 ml water
Solution B: 6 g of sodium hydroxide in 200 ml water     

 

          Solution A is heated to 35 ° C. and 0.1 g of indigo carmine. The solution is blue. Addition of solution B, the color changes to green. During the 30s, the color changes to red, which after 3 minutes, turn yellow.         

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