#things_which_glow_under_black_light

=) What is black light? 
- Black light (or) Ultraviolet light is a form of electromagnetic radiation with wavelength from 10 nm to 400 nm, shorter than that of visible light, but longer than X-rays. 
-UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun.

=) Why do substances glow under UV light?
- Fluorescent substances absorb ultraviolet light and then glow when they re-emit it. Phosphorescent materials (phosphors) make light much the way fluorescent materials do; they radiate visible light after being energized.

Some materials which glow under UV light :-
- Highlighters.                                      - Bank notes 
- Detergents.                                        - Eggs
- Tonic water (quinine content).        - Teeth
- Olive oil.                                              - Blood
- Rock salt.                                           - Insects
- Petroleum jelly (Vaseline)
- Turmeric
- Honey
- Paper
- Gemstones

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