If honers in Solingen have been using convex stones for the amount of time we are told, which I have no reason to immediately doubt, there have obviously been many razors made in the past that were honed on such stones without the issue of frowning.
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You can overhone the middle of a razor on a flat hone that is sufficiently narrow.
I think it is the convexity down the length of the hone which provides the supposed primary advantage of using such a hone, as it theoretically creates a concave bevel and thus a theoretically lower bevel angle. The left to right convex is to apparently account for the fact that no razor is truly straight (theoretically) and so being able to isolate various areas of the blade is an additional advantage.
Whether these theoretical advantages, turn into real world advantages that are perceptible to the end user seems to be the bone of contention. I'm not intuitively convinced but I'm keeping an open mind.
Really ??? Where is this info, so far we see one source making that claim, you would think there would be old manuals explaining how the old "Masters" convexed their hones to achieve this edge
You would think that Escher etc: would have convexed their rocks but hmmmmmm we don't see that now do we
Ain't seeing a multitude of old barber hones convexed to achieve this out on eBay either, nor do we see the idea of it pointed out in the Barber's Manuals
I am not being snarky I am just pointing out the fallacies here,,, you made assumptions without proof
I'm not making any assumptions. Literally almost every post I've made has words like theoretical in it. The assumptions are made by others that I am referencing in my posts. I have already stated that I am not entirely convinced that the convex hone creates sufficient concavity in the bevel to be meaningful, but maybe I am wrong. We're here to learn right?
Which is a distinct issue in itself aside from the use of the convex hone. Maybe the convex hone makes it easier to cause a frowning blade for someone who isn't a great honer. Seems entirely possible. That also doesn't preclude the reasonable assertion that someone who is good at honing can create a flat edge with a convex hone.
We're just talking about rocks man.
I think you're reading my responses in an uncharitable fashion.
I've been respectful and kept an open mind throughout.
Any assertions (ie, that the convex hone has historicity to it) are not MY assertions, but those of others that I am relaying. I have no immediate reason to think those people are misinforming.