Milk Rainbow



1)     Fill the pie plate with warm, whole or 2% milk.

2)     Add a few drops of food colouring in the centre of the pan. Make sure each drop of food colouring is separate from the others.

3)     Add a drop of soap to the very middle of the pie plate. Watch what happens!

Explanation: Milk is made up of water, vitamins, fats and proteins. The last two of these ingredients are fairly sensitive to changes in the solution. Adding the soap causes the milk to react with the sap and alter solubilities. This causes pandemonium with the fat and protein molecules and they start to bend, twist, contort, and swirl into all sorts of shapes. The food colouring simply acts as an indicator of the changes that are taking place.

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