User: How do I make a rainbow with colors and oil and water
Assistant: Hmm, I’m not quite sure how to do that, but I do know that rainbows are formed due to dispersion of white light by small water droplets -- moisture in the air -- in a way that’s dependent on the size of the water droplets.  And I know this because rainbows are often caused by light shining through rain clouds.  So it sounds like you would need to find some kind of project that makes a small water droplet, otherwise you won’t be able to make a rainbow.  You could try making a prism!  Or let some water from a tap drip into a container.  Or a water shooter would work too!  

Whatever you end up doing, you may want to use a little water-soluble oil to