Ok guys, I will admit, I was completely skeptical of this, and made fun of it prior to trying it tonight, but let me tell you up front, I noticed a noticeable improvement.
Here's how/what I used:
One of them fat stinky smelling felt tipped permanent black markers, you know them things that write really sticky and will seriously mark on anything, aluminum casing... (opaque oil based ink) Colored in both the outer edge and inner edges of the CDs, and also did the top and bottom inner clear circle part.
I did a double blind test with the original, an old backup burn(colored in), a fresh copy (colored in), and another fresh copy (uncolored). My brother did the switching of the CDs.
Here's what I noticed:
right away, it sounded different, but I couldn't quite figure out what, it sounded compressed for some reason.
Then...
lower noise floor - I thought it sounded louder
deeper tightened bass
stronger more extended decay
overall better refinement and more detail
It's just like going from normal to upsampled.
Seems crazy, but I tried it on both my main headphone system and portable rig.
p.s. I tried armor all as surface treatment, but it didn't do anything, lol. I'll try some isopropyl w/ photoflo later.
additional info:
album used - Ja Rule - Pain is Love
No Doubt - Excuse Me I'm the Singer
more albums soon to be tested...