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However, they may have lost their temper in transit!

This will add 2 variables to the equation: different blades and different stones. If you wanna do it scientifically you need to change only one variable at a time. But that of course would mean you...

Joel on B&B has extensively written about his honing experiments, IIRC he bought 12 identical DOVOs and started honing them on various mainly natural hones.