It turns blue in natural sunlight and any other partially or wholly ultraviolet light source.
From the en.wikipedia.org
Helium-cadmium lasers are a common source of blue-ultraviolet laser light.
From the en.wikipedia.org
When the solar system was forming, the protosun was a potent source of vacuum ultraviolet.
From the sciencedaily.com
The sixth, with a fluorescent pigment that glows red when exposed to ultraviolet light, allows checking of an ultraviolet light source on MAHLI.
From the sciencedaily.com
A contact negative the same size of the finished print is then placed on top of the dried coating and exposed to an ultraviolet light source, typically bright sunshine.
From the en.wikipedia.org
He suggests the bugs could be using ultraviolet light from the Sun as an energy source.
From the newscientist.com
Because they are an important source of ultraviolet photons, Be stars play an important role in the heating of galaxies.
From the sciencedaily.com
The Red Rectangle displays several phenomena that require far-ultraviolet radiation as a power source.
From the sciencedaily.com
For its part, the Indoor Tanning Association maintains that overexposure to any source of ultraviolet light, including sunlight, is potentially dangerous.