tenebrescence


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tenebrescence

[‚ten·ə′bres·əns]
(physics)
Darkening and bleaching under suitable irradiation; materials having this property are called scotophors; darkening may be produced by primary x-rays or cathode rays, while bleaching may be produced by heat or by photons of appropriate wavelength.
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Some of these chapters handle relevant scientific concerns: the nature and origins of fluorescence, tenebrescence, triboluminescence and thermoluminescence; trace-element activators; and commonly fluorescent species, as presented in paragraph-length accounts.