What's happening to this disc - discolouration

Blank Media
#1

While dusting off my game collection, I noticed a weird uneven discolouration near the hub of one the discs. This is a pressed CD, specifically Master of Orion 2 (though I don’t think that’s relevant). I don’t think it was like this when I first got it.

It seems to read OK for now, but it’s something I’ve never seen before, so I hope maybe someone here has and could tell me what’s going on with it.

I’ve attached a scan of the disc. It shows a the discolouration near the hub quite well, and despite the hue of the disc in the scan, it’s a pressed CD and looks silver. I’ve cleaned it, so it’s not a grease smudge, it’s actually in the disc.

Thanks

#2

looks like there was some contamination when the disc was made and that a chemical reaction has started. had the same thing happen to one of my dvd’s. its unplayable now :frowning:

best make a backup if its still readable.

#3

Thanks.

I had already backed up the disc as a precaution, but I was curious what was going on with it. Never encountered anything like it before – at least not on my originals.

#4

From the picture the discolouration looks a bit like an air bubble - wonder if the disc is starting to de-laminate and some air has got in between the two layers?

#5

It may be DVD rot.

#6

So crap. Burnt discs last longer hahaha

#7

How has this disc been stored?

#8

In original jewel case, on a shelf, vertically. The jewel case was sandwiched among others on a bookshelf. The room is air conditioned in summer, and heated in winter. Last time I took the disc out to play it was maybe 2 years ago. This seems to be the only disc in my collection that has anything like this.