How does this stuff compare to the diamond pastes? I guess I'm looking for a grit comparison if that's possible.

All that the entry at Classic Shaving says is that the red is to sharpen dull razors and the black is to polish/finish the edge. That's a little too vaque for me.

I've got razors (eBay razors!) that I have sharpened to the point that most of them will cut a hanging hair, but not really pop them apart like some people describe. I'm thinking that maybe this would give that tiny bit more sharpness.

Don in Ohio