Take 2-3 crystals of potassium permanganate and dissolve them in 100 ml of water.
• Take out approximately 10 ml of this solution and put it into 90 ml of clear water.
• Take out 10 ml of this solution and put it into another 90 ml of clear water.
• Keep diluting the solution like this 5 to 8 times.
• Is the water still colored ?