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Hi all, I hope the science is treating you well.

I was wondering if anybody has heard of a good standard sample for 
comparing photobleaching.  I want to compare how different microscopes 
perform under different conditions and wonder how much the sample plays 
a role in quantifying the photobleaching rate.  I would presumably 
calculate the intensity decay over a time lapse as a metric, but wasn't 
sure if the sample type was a factor as I don't know much about the 
photochemistry.  On that note, can anybody recommend a good reference 
that discusses the subtleties of photobleaching?

Thanks in advance for your time.

Neil