I have some black CDs, Memorexes, too, though the labels are different from SuperEye's discs. There was some brief fad 5-6 years ago about black, rather than greenish/bluish-tinged silver discs, playing better. I don't remember the rational/theoretical science behind it, though I remember thinking it sounded pretty bogus. (Kind of like the green Sharpie marker around the outer edge of the CD before that.) But I tried a pack of the discs anyway.
As for the long-term viability of CD-Rs and DVD-Rs...... I have some "car tunes" CDs that go back to 2000, and they still play fine. Memorex media, too, though I think it was before the company switched to rock-bottom dollar production sources. Anyway, these discs have been in the car for all 11 years, frozen through Midwestern winters and baked in summers like the one we're having now. They're kept in a zippered wallet under the seat, so direct sunlight never hits the discs themselves or the case they're in. A couple (some Fujis, I think) have discolored a bit on top--turned from silver to gold--but still play fine. All of these discs were made in a standalone audio CD recorder (Pioneer or Sony) using the special "CD-R Music" required for those machines. And all were hand labelled wtih a CD/DVD marking pen with water-based ink. As with all my optical media, I'm careful to handle a disc only by the outer edge (and try not to grab it right after, say, picking up a piece of gooey coffee cake).
A few skip a bit during playback, due to "road rash" scratches and scuffs from 11 years of handling and sliding around on the seat or dashboard before I had time to put them back in the case. No surprise there.
All of this "torture testing" gives me a fair degree of confidence that optical media will last pretty well if stored with a little care AND if there aren't any fatal manufacturing flaws that accelerate deterioration.
P.S. How could I forget to make a compilation disc of music from "The Big Chill"? At least, I have Yanni, Air Supply, Chris DeBurgh, and Celine Dion to fill the gap......