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06-05-2006, 11:40 PM #9
There are definetly differences i the Coticule stones. Some have a distinct grain pattern in them in which a more coarse crystaline structure is seen. Most of the "Old Roc" or "exta-extra" stones as a solid, homogenous yellow with little on no grains/crystals evident.
I have gotten my best results with the more homogenous stones, other do well with the more crytstaline ones. I recently sent a very grainy looking stone to Lynn for testing and he seemed to get decent results from it.
Most natural stones have variations. The vintage Eschers I have tried all seem a little different too. Some hard, some soft with colors ranging from jet blac, to charcoal grey to a greenish/yellow tint. With any of these the underlying garnet crystals can usually be seen with a microscope.
TonyThe Heirloom Razor Strop Company / The Well Shaved Gentleman
https://heirloomrazorstrop.com/