Red Sea Fan Under Ultraviolet Light, Puget Sound, Washington
A red sea fan (Callophyllis flabellulata) appears bright orange when exposed to ultraviolet light at low tide at the edge of Puget Sound in Des Moines, Washington. The red sea fan, a type of algae, normally appears dark red or brown. Strands of kelp glow bright red in this scene. The glow is the result of phosphors that convert ultraviolet radiation, which is invisible to human eyes, into wavelengths that are visible. This scene was captured under black light.
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