Ooptical bleaching agent: a chemical which is used in the furnish of bright-white papers to enhance their brightness, and which does so by converting ultra-violet light into visible light.
A spotlight throws a pool of violet light on the stage
The direct photolysis of chlorpyrifos in aqueous solution irradiated by high pressure lamb light(HPML), xenon light(XL), ultraviolet light(UV) and sunlight was investigated.
They are only visible when they are bathed in ultra-violet light and subjecting them to such constant bombardment would be not only impractical but harmful.
The polygonal segments of the surface react to ultra-violet light, mapping the position and intensity of solar rays.
In a trench dug by a University of South Florida Coastal Research Lab team, layers of oil-stained sand light up orange under ultraviolet light. Clean sand appears violet.
Ultra-violet light is not in the part of the visible spectrum, but why does an ultra-violet lamp emit violet colored light?
The violet light of dusk began to darken the sky.
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