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I don't Steve. Will test the green one and see.

I am curious how the Black shadow compares to the green one. Nic sent me his green shadow as a gift when I helped him out with some stuff.

My 8k Snowwhite crazed, my 5k chosera did as well but the 1k and 3k are fine. Luck? Don't know. The green brick is a nice bevel setter.
Right now I am using the shapton glass series.