Science, Valentine’s Day, and candy all come together in this quick and colorful Valentine’s Day Skittles science experiment. This heart-themed twist on the classic Skittles experiment is easy to set up, produces fast results, and gives kids a clear way to observe diffusion in action.
It’s a perfect Valentine science activity for classrooms or home learning when you want something engaging without extra prep. Do you remember our classic Skittles science experiment?
The Science Behind It
Field: Chemistry
Grades: K–4
Concepts Explored: Diffusion, solutions, observation, and making predictions
Supplies Needed
- Red, pink, and purple Skittles
- Water
- White plate or shallow baking dish (flat bottom works best)
- Heart-shaped cookie cutter (optional)
How to Do the Valentine Skittles Experiment
STEP 1. Arrange the Skittles around the edge of the plate in a pattern.
Kids can alternate colors, group them, or make simple Valentine shapes like hearts or arrows.
STEP 2. Place a heart-shaped cookie cutter in the center of the plate (optional).
STEP 3. Ask kids to make a prediction:
What do you think will happen when water touches the candy?
STEP 4. Slowly pour water into the center of the plate until it just reaches the Skittles.
Do not move the plate once the water is added.
Watch as the colors begin to move outward from the candy.
Expanded Science Explanation
Skittles are coated in colored sugar. When water comes into contact with the candy, the sugar coating begins to dissolve.
The dissolved sugar and food coloring move away from the Skittles and into the surrounding water through a process called diffusion. Diffusion happens when particles move from an area of higher concentration (the candy coating) to an area of lower concentration (the water).
Because the plate stays still and diffusion happens slowly, each color spreads outward in its own space before eventually mixing. Learn more about chemistry for kids.
Make It a Science Experiment
Turn this activity into a simple experiment by changing one variable at a time, such as:
- Warm vs. cold water
- Different liquids (water vs. clear soda)
- Different candies (compare with M&M’s)
Learn more about the scientific method for kids. Formulate a hypothesis, conduct an experiment, observe, compare results, and describe the changes.
More Valentine Science Activities
If kids enjoyed this experiment, try more Valentine-themed science ideas like:
- Valentine Magic Milk
- Candy Heart Oobleck
- Heart Lava Lamp
- Dissolving Candy Heart Science
- Grow Crystal Hearts
Printable Valentine STEM Project Pack
Countdown to Valentine’s Day with hands-on STEM learning! This printable pack includes engineering challenges, STEM prompts, templates, and visual instructions designed to make Valentine STEM easy to plan and fun to teach! ❤️
