[brianshaw]

Check this out. In my experience they are a good company to deal with if you want natural Arkansas stones:

http://www.naturalwhetstone.com/productssharpening.htm

 

[brianshaw]

Bob, I'm afraid to say that you are inventing things to worry about. Everybody I know washes their knife between sharpening and eating with it.

Novaculite is natural stone. The sellers either say so or assume the buyer has the wherewithal to do a quick Google search.