Hi and thank you all for your responses! Everyone agreed that the thicker sections allow the copper pigments to be better visualized. However the responders were split 50/50 in the thickness. There were labs that did cut the sections at 3 microns with continuous good results and the others at 6 microns. One lab cut the sections at 10 microns. I appreciate all your help and now we will test on three microns too. Thanks again, Carrie
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