Quote Originally Posted by TheCoticuleWhisperer View Post
I'd avoid anything with a green or brown hue or coloration to it. Anything with black dots and lines are going to indicate a good, fast hone.
It's still all quite relative. I have a green/brownish vintage (with manganese dots) that is on the slower side both on slurry and water but leaves a really smooth edge.

It's the only coticule edge I might be able to identify correctly in a blind test out of my four coticule surfaces (three stones, one is a Les Latneuses combination).