A mossy chiton (Mopalia muscosa), surrounded by small barnacles, takes on striking colors when viewed under ultraviolet light on a rock exposed during an exceptionally low tide in Edmonds, Wahington. 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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