SaH: Rainbow Milk

Share on facebook
Share on twitter
Share on linkedin

The fat content of milk is the reason this experiment works so well! Discover how soap interacts with fat molecules. In addition, you will be able to see what happens when you mix red and blue, blue and yellow, and yellow and red. Art and science together make this experiment picture worthy! Share your results in the comments below.



  • 1 small bowl
  • Food color: red, blue, yellow
  • Dish soap
  • Toothpicks
  • Whole milk


What To Do

  1. Fill a bowl with a small amount of whole milk.
  2. Place a drop of each primary color in the milk – try to not move the bowl.
  3. Dip a toothpick in dish soap and gently drop it into the bowl and watch.

What happens to the colors?

What is happening?

Dish soap is great at cleaning fat off of dishes, and milk has fat in it. The soap repels – or pushes – fat away from it. As this happens the colors move with the milk and are mixed together! When the primary colors red, blue and yellow mix together, they make the secondary colors purple, green orange!

What other liquids could you try this in?

What do you think would be different?

Join Our Mailing List

Stay up to date on news and events by the Reading Science Center.

Share this post with your friends

Share on facebook
Share on twitter
Share on linkedin

We here at the Reading Science Center understand that these are unprecedented times. as such, we wanted you to know that we are taking the following precautions until further notice:

  • We have an air scrubber (Vollara) that we use in the Center
  • We have deep cleaning complete weekly 
  • Sanitizing every three hours using MICROBAN Sanitizing spray
  • Hand Snaitizer is readily available throughout the Center
  • Masking is required regardless of vaccination status
  • Limiting Hours (No Tuesdays until February)
  • Temperature Checks and an illness questionnaire
  • We respectfully request that if you or a family member with you is feeling under the weather, you visit us another time.  
  • If we need to close, we will post on Social Media as soon as we have made the decision

Thank You and we look forward to you and your family visiting the Reading Science Center!