HW: "the book" from Voiceprint

[Tim]

interesting...i always thought that the two-tone discs were recordable, and the monotone discs the ones that standard mfg.s released in order to tell the difference
between  cds & cd-rs. (IMO-just a wild guess)
tim
K Henderson wrote:
 >
 > A quick tech question...
 >
 > I've long wondered why some CDs have a strange two-tone hue to the playing
 > surface...you know, it looks like in the manufacturing process there's some
 > form of lacquer or something going down onto the Aluminum surface before
 > encasement in the acrylic (or whatever plastic it is).  And then for some
 > reason, the 'lacquer' doesn't coat evenly over the surface and forms an
 > irregular boundary somewhere in the middle of the disc (not to be confused
 > with the very regular boundary that is often visible which represents the
 > point at which the music 'runs out' from inside-to-outside).  I've got a lot
 > of discs with this strange two-toned hue, but none of them ever have any
 > problems being played or read.  But what I wonder is what causes it, and is
 > it really some sort of defect?  If so, then why does it happen so often?
 >
 > Just curious on a cold January day...Grakkl (FAA)