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To the average person an Escher will look gray. Within the Escher hones there are nuances of color and the hones are designated by Escher as yellow/green, blue/green, light green and dark blue. All...

Here is an tutorial on how to lap a hone from the SRP Wiki. I've gotten a couple of those that were as you describe and once the patina was lapped off they were a more gray than black. It will be...