Read this here
http://www.positive-feedback.com/Issue46/blue_note.htm
"The box is Classic's latest attempt to produce a ne plus ultra pressing of a famous recording from vinyl's golden age. Not only is the original single LP spread over four single-sided discs, it is pressed on Classic's proprietary "Clarity Vinyl," a see-through, slate-grey vinyl that eschews the black pigment—aka "carbon black"—that has been a part of the vinyl formula since the very beginning of the LP era, when it was employed to make vinyl records look as much as possible like the shellac discs that they replaced. Classic believes that by leaving the carbon black out of the mix, the LPs do not become magnetized, since vinyl is not by itself a magnetic material. (The fact that magnetically charged records sound tight and constricted is widely, if not unanimously, acknowledged among audiophiles, and I will return to this subject later in this review.)"
This seams to go against what they said in this thread here:
http://www.stevehoffman.tv/forums/archive/index.php/t-103196.html
"Vinyl is clear. There is however, an agent in the black vinyl that makes it smoother and quieter. Colored vinyl (other than black) can be noisier because it doesn't have this agent in it. In my experience, vinyl without this "agent" added does scratch more easily. (I'd heard it called "carbon black" before.) It seems the colored vinyl is softer, in other words. I've had minor "mishaps" over the past 25 or so years where my black vinyl wouldn't be harmed, where the colored easily picked up a small tick from it. The colored vinyl, too, seems to be worn a lot more than the black vinyl pressings I've seen. Groove damage seems to be more apparent on the non-black."
Personally I still think black is beautiful