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Yes indeed, potash (primarily potassium) is abrasive and could probably be used to paste a bench hone. However, the relative grit would depend on how complete the combustion of the wood was. Even...

I finish all of my razors on a bench hone pasted with CrO2. Don't know about relative costs, but I'd suggest checking www.handamerican.com
Keith has a chromium oxide formulation (liquid) that goes...