Almost 20 years ago I was writing for a real paper audio magazine. One day at the office (real job, not the mag) I got forwarded a call by an enthusiastic reader who proclaimed that for a vastly improved listening experience the white text in the logo of Sony Classical CDs had to be filled in with a certain black marker.
Hi
as the OP I don't really believe the content of my post but I have seen some CDs that are quite "see through" and cant help the feeling that some of the laser is not getting reflected back to where it should be.
Whether this has an effect on sound quality I don't know.