A couple elegant sea anemones (Sagartia elegans) glow under ultraviolet light at the base of a barnacle-encrusted rock exposed at low tide in Puget Sound off Edmonds, Washington. The anemones typically appear green or greenish-brown in regular day light, but glow bright blue under ultraviolet light at night. 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. This scene was captured under black light.
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