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The results of this test do not corroborate my theory; though I could produce small bubbles with the fatty slurry mixture, none were formed during honing.

The lather/soap-theory doesn't convince me: soap and lather dry far to quickly to penetrate any significant depth into the stone. And as it is very soluble in water, the effect wouldn't be very long...

:td Great Sham, thanks a lot. After the Charnley Forest and the Brown Escher, now we all have to go looking for a bubbling Coticule. How on earth are we going to tell in an antiques shop or from an...