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whats the difference between the blue/green (gray!) escher and a yellow/green escher?

Fred

Thanks for that clarification, Tony.

It's good to know the differences between these stones. I guess at the end of the day, most people use what they have, and love what they use. The Coticules...

Great,
but lets not throw this thread towards differences between blue & yellow Belgian stones. I'm more interested in differences between yellow Coticules and Eschers.

I read the Escher was...

From http://www.timbertools.com/Products/SharpeningStones.html

"The garnet crystals are only 10-15 microns in diameter, and penetrate about 2-3 microns ...

Hey folks,
I have been pursuing information on natural stones - Japanese stones, Chinese stones, Belgian stones, German stones... I have always been a fan of natural stones. Call me old-fashioned...