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Sure, let's forget about the color. None of the white ones I've seen are actually completely white, but pale grey, sometimes with a light blue shade.. Can you somehow show us the water absorption?...

Finally found the pic I was looking for:

http://uploads.tapatalk-cdn.com/20170108/dcbcc786e9afcd4039c56bbb9dad33db.jpg

Here you have the hardest (blue/black) that may be a razor finisher and...

Hello! That looks like a Cretan white, or grey, not blue. Maybe the flash from the camera is giving me a false impression. Anyway the point is the hardness and not the color. The harder they are,...