My kids love doing science experiments. They don’t do anything fancy: some of their “experiments” are mixtures of dirt water and sticks in the backyard. I realized years ago that you can use the good old baking soda and vinegar “eruption” to make a variety of fun experiments. We have built a clay volcano and let it erupt, we made “exploding hearts” for Valentine’s Day and most recently I thought up this science experiment for kids: A Rainbow Eruption.

We had to bring something to the preschool science fair and since everyone is rainbow obsessed lately, I thought this would be a cool experiment. It is really easy and you mostly likely have everything you need at home. It’s also something the kids can do on their own. Do it outside for less mess OR inside at the science fair, I put all of the cups for the “rainbow” in a large baking pan and simply dumped all the “eruption” out when the kids were done. A shallow storage bin would work to catch the mess too. I made this printable for the fair and you can print it out and give it to the kids to let me them make it on their own!