Does anyone know about putting marker on CDs?


I have been given a large number of CDs to sell. Many of them appear to have black marker around the edges. One has green marker in the center. Does anyone know if this would have been done on purpose as some kind of enhancement perhaps? I am wondering if this is a known practice or if I should consider all of these CDs as damaged.
smoler2016
Ghosthouse wrote,

"The Auric Illuminator kit supplies a black marker for application to the rim and central area (both sides) of a CD."

Yes, I’m aware. Apparently Auric Illuminator never got the memo.

To recap: black is only for the inner lip, that part that touches the spindle. Everywhere else, including anywhere on the surface of the CD, black hurts the sound. I also color the data side of the CD in a very limited but important way.  I actually use four count em colors. . Don’t try this at home, kids.
You can remove Permanent marker by applying Dry Erase marker on the top and wiping it off.
You could contact RTI and see if their machines could remove the ink.
I bought their Pro model to remove scratches and polish my aging discs.
"You could contact RTI and see if their machines could remove the ink.
I bought their Pro model to remove scratches and polish my aging discs."

Shirley you jest.