As if fireworks weren't already colorful or spectacular enough on their own, these DIY fireworks glasses take 4th of July festivities to the next level! Make your own "fireworks glasses" using simple materials and enjoy an eruption of rainbows everywhere you look!
Have you ever noticed a rainbow glancing off the back of a CD or DVD? Diffraction grating works in a similar fashion. On a CD or DVD, information is stored in the tiny dents and grooves engraved into the surface. When light hits these, it reflects at different angles, allowing us to see the colors of the spectrum in what otherwise looks like white light.
The diffraction grating is a transparent film with many tiny parallel scratches on its surface—the ones we used have 13,400 scratches per inch. When light shines through it, it's separated into all the colors of the spectrum. For obvious reasons, glasses like the ones you just made are also called rainbow glasses.You don't need to wait for a fireworks display to use yours either! Try looking at a TV or computer screen, at the light in your room, or at stars.