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That's good thinking, Hi_bud_gl.
If the first sharpening in the knife shop was done on a belt grinder, or on something similar, there's a high probability the temper of the edge got ruined. However...

For some advice:

First moisten your fore arm, lay the razor flat on your arm, lift the spine about two times its own thickness, and try shaving a patch of arm hair. This should be very easy. If...