Ok.... I will go with Tyler on this one..... (If for no other reason than to cause controversy )
I have to admit.... The darker the dye color the better the PS2 tends to read the disc.... This has been my personal experience.... Whether or not their is a scientific reason as to why, I cant answer......
BUT.... IMO.... If you have two discs side by side and one has a darker dye than the other, use the one thats the darkest.... It will produce better results.... At least this is what I have found from personal experience....
OK... Now that Ive said that.... You guys can abuse me!
That's all cr*p!! I've given the technical explanation - the dye colour is irrelevant save where it denotes particular chemicals. Those chemicals have to react with the laser burner's light to form the opaque pits.