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Published online by Cambridge University Press: 14 March 2018
Post-fixing with osmium tetroxide before silver-staining sections causes problems because the OsCU can etch the deposited silver. However, it is not a good idea to perform silver enhancement after osmium tetroxide treatment because the deposited osmium can also act as a nucleating site for silver deposition, and the osmicated regions of the sample will be silver enhanced. If gold-toning is used after OsO4 post-fixation, the OSO4 can also nucleate gold particles. OsO4 should always come after silver enhancement.