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Sham,

I am aware that we both appreciate Coticules, albeit we seem to appreciate them somewhat differently. There is also no doubt in my mind that you are a trustworthy person, and I will be happy...

I can verify that come substances are capable of penetrating a Coticule.
I had this hone, made from a piece of raw Coticule, that I had picked up at an old abandoned mine.
The slab of stone I...

Based on the info given so far, this seems the clearest and most likely explanation.

I have not a single clue.
Like Gary said, sometimes thined slurry can behave a bit like soap, certainly if there is a fair amount of steel particles in it (which makes it grey soap :)) but nothing...