Sea Anemones and Barnacles Under Ultraviolet Light, Puget Sound, Washington

Sea anemones, barnacles, and a sea star take on striking colors when viewed under ultraviolet light at night during an exceptionally low tide on Puget Sound off Edmonds, Washington. The vibrant colors are the result of fluorescence, a type of photoluminescence, in which certain chemicals absorb light that is invisible to human eyes and emit some of it at a different wavelength that we can see.