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Valentine’s Day Marbled Milk STEAM Activity for All Ages

Hand stirring red food coloring within Valentine's Day cookie cutter placed in milk

Celebrate Valentine’s Day with a fun and easy STEAM science activity that teaches children about chemical reactions. It only takes a few common household items to create a beautiful marbled heart!


  • Milk
  • Dish Soap
  • Red Food Coloring
  • Clear or White Dish
  • Valentine Cookie Cutter
  • Q-Tips


  1. Add enough milk to cover the bottom of the white or clear dish.
  2. Place the valentine cookie cutter in the middle of the dish.
  3. Add a few drops of the red food coloring to the milk inside the cookie cutter.
  4. Dip a Q-Tip in the dish soap and dab it on the food coloring.
  5. Use a dry Q-tip to swirl the colors and create beautiful designs!


  • What happened when the dish soap touched the food coloring?
  • Did everything eventually mix together?
  • What color did this experiment create?


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