Here are some simple science experiments, using all the colours of the rainbow! Great way to teach primary and secondary colours through science!
Rainbow Crystal Garden - Create this delicate rainbow crystal garden.
Rainbow Fireworks In A Jar - Explore liquid density by creating a firework effect in a jar with this simple activity.
Rainbow Walking On Water - Children will be excited to see how the colours transform over time as the water moves from one glass to another.
Rainbow Paper - Using nail polish, this science experiment will enable you to create rainbow patterns on paper.
For more: Easy Science Experiments For Toddlers and Preschoolers