If you’re looking for a quick and fun way to combine art and science at home, this rainbow experiment is such a magical activity to try with your kids. My child absolutely loved watching the colors change and spread, and honestly, I did too! It’s one of those simple science activities for kids that feels almost like a little magic trick.
The best part? You probably already have everything you need at home.
This activity is a great way to introduce basic science concepts like absorption and color mixing while still letting kids be creative. Plus, it only takes a few minutes to set up, which is always a win for busy parents.
What We Did
We started by drawing a rainbow on a piece of paper towel using washable markers. My child carefully colored each stripe of the rainbow — red, orange, and yellow — and added fluffy clouds at both ends.
Then came the exciting part.
We placed the paper towel on top of a plate with a little water in it. Within seconds, the paper began to absorb the water and the colors started spreading through the fibers of the paper towel. The rainbow slowly transformed into a soft watercolor version of itself.
My child watched closely and was amazed as the colors blended and became brighter. It really felt like a tiny science experiment happening right in front of us.
Materials You’ll Need
To make a rainbow experiment at home, you only need a few simple supplies:
- Paper towel or thin tissue paper
- Washable markers (red, orange, yellow, blue, etc.)
- A shallow plate or tray
- A small amount of water
Optional: You can lightly sketch a rainbow shape first for younger kids who might need a guide.
How to Make a Rainbow Experiment (Step by Step)
1. Draw the rainbow
Give your child a piece of paper towel and some markers. Ask them to draw a rainbow with several colorful stripes. They can also draw fluffy clouds on each end of the rainbow.
Encourage them to use bright colors and trace the lines well so the colors show clearly.
2. Prepare the water plate
Pour a thin layer of water into a shallow plate or tray. You only need enough water for the paper towel to absorb it.
3. Place the paper towel on the plate
Carefully lay the paper towel on top of the water in the plate. Within moments, the paper towel will start soaking up the water.
4. Watch the colors spread
This is the fun part! As the paper absorbs water, the marker ink begins to spread and soften. The rainbow will start looking like a watercolor painting.
Kids love watching the colors slowly move through the paper.
5. Lift and reveal
After a minute or two, gently lift the paper towel. You’ll see the rainbow with a beautiful blended effect.
Lay it flat to dry and you’ll have a colorful piece of art to display.
Why This Science Activity Is Great for Kids
This simple rainbow experiment is more than just fun — it also introduces kids to basic science concepts in an engaging way.
When the paper towel touches the water, it absorbs it through tiny fibers. As the water moves through the paper, it carries the marker ink along with it, causing the colors to spread.
Through this activity, kids practice:
- Fine motor skills while drawing
- Creativity through coloring
- Observation and curiosity about how things work
And best of all, they get to see science happen right before their eyes.
If you’re looking for easy science activities for kids that don’t require a lot of preparation, this rainbow experiment is a perfect choice. It’s colorful, exciting, and gives kids that wonderful “wow” moment when the colors begin to spread.
My child loved watching the rainbow come to life, and it’s definitely an activity we’ll be doing again.
Have you ever tried to make a rainbow experiment with your kids? It’s such a simple way to turn an ordinary afternoon into a fun little science adventure.
