Rainbow Milk is a relatively new experiment to me. I was first introduced to it via a Facebook post of a friend who was complaining about the fact that it didn't work which, of course, made me curious. If you haven't seen this experiment before, essentially blue, red and yellow food color is dropped in a triangular shape in a bowl of milk. Dish detergent is then added to the middle and the food coloring starts to move across the milk, creating rainbows. The reasoning behind it is a bit complicated (I'll talk more about it later), but for young kids its a great way to explore a little about what makes up milk. You could also talk about rainbows, color combination and surface tension - all in one small experiment!
- liquid food coloring
- bowls (the wider the better)
- liquid dish detergent (Dawn works well)
- cotton swabs
- small bowl for holding dish detergent
- a few types of milk (we used skim, 2% and heavy cream)