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Give it a good rubbing with a piece of steel, mostly anything will do but if you've got something that needs sharpening anyway... like lawn mover sheers.
You can use it dry with steel but they do...

Hmm, you're probably right it can happen but I have never had any problem with it.
I use the slurry for final polishing and it's "clean" from any gritty things, I'm sure I just got jinxed and next...

They don't?
Mine do but if they are broken in and used with water they don't release any stray diamonds!
That's until they get really old and used up...

I save slurry from my Jnats for other use, an broken in DMT or any good diamond plate won't contaminate it in the first place.
Make sure the diamond plate is broken in (no loose or high diamonds),...