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Most barber hones are non-porous, so when you put water on them it beads up and each stroke of the razor will push water off the hone. Even very dilute lather breaks the surface tension of the water...

Please don't lap that hone. It looks to be pristine. Why would you lap it without trying it first? Most barber hones don't need to be lapped, ever, but if you use it and discover a problem then...