Thread: Scratches when using DMT 325 as lapping stone

At the advice of a very well respected source, I ordered a DMT 325 to lap my shapton 16K. It arrived a few days ago, and today (well, yesterday, technically) was the first time I cad a chance to actually use it. It certainly seemed to lap just fine, but it left a bunch of scratches and gouges in the Shapton, a couple of them deep enough to feel with the edge of my fingernail; I can't imagine that to be good for honing. Has anyone else had a similar experience? Am I doing something wrong?

Here are some picks, I rubbed pencil graphite over the scratches to make them more visible: