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Yes good to see you and thanks for starting a dialog Alex. As you know research AND practice is an important part of learning to rightly divide the truth. Topics regarding the use of dished, concave...

Here is the razor hone referenced here.
https://www.google.com/patents/US2111667?dq=straight+razor+hone+stone&hl=en&sa=X&ved=0ahUKEwiD1oqm5LrRAhVm7oMKHfweDNUQ6AEIKDAC
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For those that may be interested in how synthetic abrasives were manufactured. Attached is an interesting article on the use of Litharge or Lead oxide filler as opposed to iron, zinc or chrome oxide...