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2. Rainbow Tube Experiment I have experimented to find out how make a rainbow tube with different coloured sugar water. I got 4 cups each consisting of 30ml of water. Then added 2,4,6 and 8 spoons of sugar in each cup respectively. Mixed the sugar till it dissolved completely. Mixed 4 different colours of paint into the combinations of sugar water. Hence, got 4 coloured water. Slowly poured 5 ml of coloured water into test tube with the heaviest density water first. I got the lovely 4 colours in the tube, as you saw in the pictures.