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Keep it simple. People have shaved with razors honed on "8000 grit hones" (they weren't even around back then) for centuries.

As to chromium oxide: no. Do read the article on pastes or sprays,...

4000 will almost do. Make a so called balsa strop (Easily make a pasted balsa strop - Straight Razor Place Library) with a high grit abrasive (What hone(s), paste(s), or spray(s) do I need? -...