Given that my kamisori are only sharpened on one side of the blade, I'd say that the "dull side of the razor" you are experiencing is more likely down to a technique / angle of blade thing, rather than a metal thing.
@mashton started
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Given that my kamisori are only sharpened on one side of the blade, I'd say that the "dull side of the razor" you are experiencing is more likely down to a technique / angle of blade thing, rather than a metal thing.