...on these Naniwa stones?

I've been working at honing, but only dulling my razor, when I got the idea in my head that I hadn't lapped my hones enough -- On one of them, the 12k, I figure I did lap it sufficiently -- after which the even coloured surface gave way to a speckled consistency underneath. That stone didn't seem to do any damage. It's when I went back to the 8k that things got worse.

I hadn't assumed that all the stones are the same as the 12k -- with the speckled consistency, but after slaving at the kitchen sink for half an hour last night (a woman's work is never done... [don't quote me on that]), I found the same thing on my 5k stone. There's a speckled consistency beneath the even colour that seems to come off (with much effort) in a fine silt that gums up the DMT.

Hopefully I've described this well enough. Does this sound right to everyone?

Thanks

Brenton