Hooked On Science: Milk Rainbow



PLEASE follow these safety precautions when doing any science experiment.

  • ALWAYS have an adult present.
  • ALWAYS wear the correct safety gear while doing any experiment.
  • NEVER eat or drink anything while doing any experiment.
  • REMEMBER experiments may require marbles, small balls, balloons, and other small parts. Those objects could become a CHOKING HAZARD. Adults are to perform those experiments using these objects. Any child can choke or suffocate on uninflated or broken balloons. Keep uninflated or broken balloons away from children.


  • Whole Milk
  • Food Coloring
  • Dish Soap
  • Cotton Swab
  • Deep Dinner Plate


STEP 1: Fill the deep dinner plate with whole milk. Describe and classify the whole milk by its observable properties.
STEP 2: Add drops of different food coloring to the milk. Make sure the drops of food coloring are evenly spaced.
STEP 3: Dip the end of the cotton swab into the dish soap. Describe and classify the dish soap by its observable properties.
STEP 4: Touch the tip of the cotton swab, with dish soap, to the surface of the milk and observe. Describe the whole milk, with food coloring and dish soap, by its observable properties.


The milk contains water, proteins, and fats. Milk is mostly water and has surface tension. Surface tension is a force present within the surface layer of a liquid that causes the layer to behave as an elastic sheet. The dish soap reacts with the fat, in the milk, and reduces the surface tension, creating a milk rainbow.

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