Good question. Authentic Japanese swords had a hard edge, 57-59Rc. When the sword is polished, it is also sharpened in the process. Its like you can't do one without the other. When you polish you sharpen, and when you sharpen, you polish. For the most part, its the edge geometry that does the cutting, traditional Jap. sword had convex, moran edge which, with proper technique(sp), could stay sharp infinatly, but its the technique that really does the work.
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Squash, Make Flat...
[This message has been edited by Katana1 (edited 09 October 1999).]