Graham,
I am having to deal with the same issue right now. For me, it's a cedro neck with an ebony reinforcement strip running down the center.
I recall a tip Bill Cumpiano passed along in another forum regarding sanding dust contamination. He said that the finest sandpaper one should use when dealing with different contiguous woods is 220 grit. Reason being that most wood fibers will allow dust finer than that produced by 220 grit to become lodged in them. So as long as you don't go beyond 220 grit you're OK.
Well, when it comes to cedro and ebony, I'd have to say that this is just sort of true. So what I do is I sand with relatively course paper, like 80 and 150 grit -- or even a file or rasp. Then when I'm getting close to final shape, I will wipe the area down with shellac to seal the deeper pores. That way, when I use a finer grit paper, the ebony cannot become imbedded in the pores, and will usually come out just if wiped with a clean cloth.
Best,
Michael
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