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Pink fluorescein??

Dr E. Buxbaum EB15 at le.ac.uk
Mon Mar 18 12:33:01 EST 1996

Ah, got cha! The colour of fluorescein depends on the charge of the 
material it is bound to. Chemist actually make use of the effect when 
they titrate chloride with silver nitrate solutions. Fluorescein is added 
as an indicator, which absorbs to the silver chloride precipitate. If 
cloride is in excess, the particles are negatively charged, if silver is 
in excess, they are positive. So you get a sharp transition from green to 
pink and back. 

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