Science Experiment: Rainbows

By TheDadLabFrom BoclipsSeptember 29, 2025

This experiment puts a new spin on the old volcanic eruption experiment. Using hearts to keep it Valentine-themed is a fantastic way to get your kids interested in science and art. Fuel their imagination, creativity and love of science with a colourful baking soda heart eruption.

MATERIALS:⠀
- Baking soda⠀
- Different shades of food colouring
- Water
- Heart-shaped ice tray
- Vinegar
- Hand wash

INSTRUCTIONS:⠀
(1) Add a few drops of food colouring to baking soda, add a little bit water and mix
(2) Repeat with different colours.⠀
(3) Add the mixtures to a heart ice tray⠀
(4) Freeze until solid
(5) Lay them out in a deep bowl
(6) Add hand wash to vinegar and mix
(7) Pour the mixture over the hearts and watch them fizz
(8) Mix up the foam to create colourful art

SCIENCE EXPLANATION
When we mix vinegar and baking soda, they react and produce a gas - carbon dioxide. We added soap into the mix. So the gas blows bubbles, creating a lot of foam.

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