Glow sticks are incredibly popular for their simplicity yet versatility. Glow sticks aren’t already glowing in the pack when you buy them.
You have to snap the plastic outer tube, which has a small glass tube inside containing a bunch of chemicals. When these chemicals are released, they react with the hydrogen peroxide and dye in the outer tube, making them glow.
This project introduces the idea of chemical reactions while showing off the art and beauty than can come from complex chemistry.