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Well, I can certainly use a correct size honing rod to work on each notch but even if I spent several hours on it, the knife is never as sharp as new, which is what I consider sharpenable to mean....can you restore it to how sharp it was when you bought it?
Could totally be doing something wrong, but I stand by my comment. Once a bread knife loses its initial sharpness its near impossible to get it back.
You can sharpen serrated blades, does take longer and requires a bit more care obvsly.