CD damage – anybody seen such a mark (<800kb photo)

Looks almost like a burn, and not on the top layer as much as either on the foil (would ask what the foil layer looks like) or within the plastic of the disc.

It doesn't look like disc rot, maybe a liquid spill of some sort?

Have you tried this?

Maybe it is some Kind like the "Lethal Weapon DVD" issue....

https://movie2digital.net/index.php...weapon-dvds-mit-den-jahren-oberfläche-kaputt/
https://www.google.de/search?q=leth...XAgP0HHbEMDxEQ_AUoAXoECAEQAw&biw=1280&bih=559

@FAST6191 Keep in mind that it doesn't look that dark in reality. Still a plausible idea. But how? The mark is inside – neither on the polycarbonate protective layer nor on the label side. The label side is a 100% perfect.
@CoolMe Also a plausible idea. Same question: How should it have gotten inside? No visible damage (upside, downside, edges).
@SaulFabre No, I didn't. The surface is okay. This is why the damage is so puzzling. Resurfacing won't help.
@alexander1970 Wow! This discs look awful! But is seems more like on the surface so that resurfacing might help (when wearing gloves; I feel sick from just looking at this)

Thanks for the ideas/comments.


Forgot to mention: The disc is CD1 of the game Catwoman (which got pretty bad reviews – I found it interesting on the first minutes, but it crashed frequently on my test machine). The disc still authenticates, but the game doesn't install (just from the one drive). My burners were semi-successful at creating a copy (Safedisc 3.20.20). The CD-R copy only passes the check in some drives.

Sunburn?