Water and oil don’t mix. Neither do milk and oil. Here’s a fun way to demonstrate that using a few items you probably have in your kitchen right now.

Supplies:

Exploding Rainbow Supplies

  • A pie pan
  • Whole Milk
  • Food coloring
  • Dishwashing soap

Directions:

  1. Fill a pie pan nearly full with whole milk. Milk looks like a white liquid, but it’s really tiny drops of fat suspended in water.
  2. Exploding Rainbow 1

  3. Add three drops of each color of food coloring.
  4. Exploding Rainbow 2

  5. Add some dishwashing detergent. This will break the surface tension of the milk.
  6. Exploding Rainbow 3

  7. Watch the colors explode as the dishwashing detergent interacts with the watery liquid and the fat, creating currents that mix and swirl the colors. The show can last up to twenty minutes!
  8. Exploding Rainbow 4

Originally written for and posted on the now-defunct My OH! Momma website.