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On a microtome you are polishing a nano bevel with fine talc.
While older microtomes look like straight razors, they are used more like a knife for slicing than scraping like a razor.
Polishing a...

I can verify that the use of talc on microtomes with either a vibrating plate or stropping on glass with talc. I do it every time I use a microtome.
I haven't felt it necessary to take a razor that...