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That's a sign that the edge is getting close to done. You can dab a little lather (very little) into the water/slurry and it won't dig in as hard.

Actually he sells the cheaper ones unlapped. The more expensive ones he sells are lapped flat, you can find out in the sellers product info below.

We just started the C-Nat-athon and it's all about these stones. http://straightrazorpalace.com/honing/80656-c-nat-athon.html