pH indicator

Mahlon G. Kelly mgk at faraday.clas.Virginia.EDU
Thu Apr 18 00:36:55 EST 1996

Esther Ceren  writes:
> I am looking for the name of the chemical/pigment that changes it's 
> color from blue to red in the presence of an acid and to green in the 
> presence of an alkali. 
> Your help would be greatly appreciated.
> Esther

You have received some sophisticatedesponses, but is it
possible that you are looking for litmus paper?
Associate Professor (Emeritus)
University of Virginia
mgk at

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