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Tony,

You're right. I took a look at the slurries of both stones and at 400x magnification I saw the garnets. At 40x I could not see them however.

I'll have to have a look again!

Tony,

How do you recognize garnets under an ordinary microscope? I have had look with my mike but at 100x magnification all my hones, whether Arkansas, coticule or Thuringer, look pretty similar....

A German member of Nassrasur compared the vintage Thuringers and the Manufactum Thuringers and found their composition to be identical. Looking at the pictures I do not think they have garnets in...

You really do not need a huge coticule. I spoke to Maurice Celis of Ardennes Coticules last week and he told me that coticules 8x3" are not as good as the smaller ones. Apparently the best quality...