I've *seen* the black colored CDs (Hugo gave me some stuff on them last year at Amersfoort), and they are really cool looking, I hadn't seen them before up until that time. But I don't have any blanks to test with. Haven't tried buying any yet.

Problem is, because the black plastic hides prying eyes from seeing the substrate material, I have no idea what kind of dye lies under that plastic. My guess is that the dye beneath the plastic is going to be exactly the same as the normal TDK and Memorex media. Memorex I know for sure is the yellow stuff, I haven't seen TDK discs in a while.