Iridescent coatings are thin layers of material that create a rainbow-like effect when light hits them. This phenomenon occurs due to the interference of light waves reflecting off the surface. Commonly found in products like soap bubbles and butterfly wings, these coatings can also be applied to various surfaces for decorative purposes. These coatings are often made from materials such as mica or titanium dioxide, which enhance their visual appeal. Iridescent coatings are used in cosmetics, automotive finishes, and art supplies, providing a unique aesthetic that changes with the angle of light and viewer's perspective.