Oxidized buckminsterfullerene absorbance
The absorbance is proportional to the concentration of the C60O3 in solution, so observing the absorbance as a function of time is essentially the same as observing the concentration as a function of time.
Source
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"John Hutchinson, Reaction Rates. October 20, 2012."
http://cnx.org/content/m44309/latest/#fig2
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