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Don't go for the African blackwood if you are going for as close to black as possible with natural wood. Gaboon is the most black of all the ebony woods that I've worked with.

Here's a set of...

Ebony is great for replacing black scales. I like gaboon ebony personally...
http://i264.photobucket.com/albums/ii197/rosscollins3/DSC_4663.jpg