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I know that (aq) fluorescein "absorbs" UV light and releases light in the visible spectrum , but how does it do that. It is a really interesting and useful organic chemical and I just wanted to know what goes on in it so that it lights up.

Fluorescein dissolved in water

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The process is called fluorescence. Some substances, such as calcium sulfide, $\ce{CaS}$, absorb light and release it slowly in a process called phosphorescence, glowing for some time after the source of light is removed.

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  • $\begingroup$ Your answer is usefull! $\endgroup$ – Adinex Apr 5 '18 at 10:15

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