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In that case, neither of the two I had (one midrange, with su, extremely fast and soft, the other very fine and hard) had anything like that.
 
I've read that too, but been puzzled by what "scratchiness" in a hone would be. The only way it hones in the first place is by scratching steel.

The explanation is that, in a scratchy Karasu, the dark spots are either harder than the rest of the stone, or they have harder particles in them.
Like a too-hard Ozuku that will leave a highly polished bevel with many fine/deep scratches.
A too-hard Ozuku is common, I've seen and used a couple. But a scratchy Karasu has yet to cross my path.
 
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