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OK, like the ending of a good mystery novel.. I will never tell
especially so if I have not read the whole book first.

Thanks, part of what I am looking for... This might be part of the magic.
Slow and steady I think the secrets will be known...

I am not sure the pH change is to a more acidic value.
It can shift the pH to 1 or 12. Etching might take place
at either direction and it need not be that extreme depending
on the chemistry.
...

Abrasion pH is a phenomenon where minerals alter
the pH of water when they are ground to a fine powder.

There have been a number of comparisons of man made
and natural hones that comment on the...