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We've used the reflectance mode of the confocal for biological samples 
stained for specific proteins with gold, silver and enhanced with other 
metals such as Ni.  There are also a number of histological methods, such 
as a lead ATPase reaction, that work well in reflectance mode.  In 
addition, more like materials science, we've imaged into epoxy blocks 
prepared for EM.  Works great.

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Michael Cammer   Analytical Imaging Facility   Albert Einstein Coll. of Med.
URL:  http://www.aecom.yu.edu/aif/