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When I was just dipping my foot into the Escher waters, I asked Lynn Abrams and Tim Zowada which of the colors they favored. Lynn said there were subtle differences between the blue/green and...

I used to recommend the credit card sized DMT 325 for slurrying but someone, Disburden IIRC, reported that the diamonds come off and mix with the slurry. I used one to good effect for awhile but soon...

Glad to hear that you are not obsessing over it ...... :rofl2:

All Eschers, thuringans are shades of gray. The various colors are a hue that is subtle. A practiced eye may be able to ID a stone color wise from a photo. Many examples in this archived thread here .