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[TheBoy]

Doubt for one minute it is how well sealed the dye is, more likely to be crap construction during the production process

What made me think of the sealing bit, was that I recall a product many years ago that claimed to offer enhancement to CD quality by use of a special "paint pen" that was applied to the side edges to seal them up.

I remeber thinking at the time that it was complete boswellox, and the product disappeared just as fast, but did get me thinking that maybe moisture was getting inside somehow.

It's certainly a possibility that I wouldn't rule out, but then some of the el cheapo discs I have had that developed defects would develop the fault bang in the middle of the dye with no visible trace that it started from the outer or inner edge.

My money would still be on it being a cheap dye used, and simply breaking down chemically for whatever reason.

Noticed also on a couple of very early genuine discs (100% Acid Jazz rings a bell)  that they look as if they are starting to go "rusty" around the edges and the brown marks are creeping towards the media - Whats that all about?
:-?

F**k knows mate, but I have at least 1 genuine "pressed silver" that started off just as you describe - and finished off with all the brown crap falling off the outer edge....along with the dye (disc is now unplayable where the last 3 tracks are concerned because it is now transparent).

I had a shop bought DVD that went similar. Obviously being a DVD, it had never been anywhere remotely damp like a car changer.  Probably mis-stored by likes of Play/Amazon/HMV/whoever it came from

[Radiomarko]

The daft paint pen thing was something to do with reducing refraction from the edge... or more simply as you put it Dave DND "boswellox"   

Fogging and brown marks are all symptomatic of what is loosely described as cd-rot.

The dye can break down, the laquer sealant may be imperfect allowing moisture or an oxidising agent in, galvanic reactions between poorly chosen materials... many reasons. Basically if you pay 10p per disc you are not likely to have useable data for as long as you would on a Mastering Quality disc that is properly stored.

http://en.wikipedia.org/wiki/CD_bronzing

Is worth a read.

I owned a recording studio for 15 years back in the day, now don't get me onto multi-track tape degradation and storage problems..... I now have a large archive of Betacam tape broadcast material that I can worry about instead. Thank gawd for digital tapeless storage... oh shit new problems   

[Hannah Judes Dad]

Just thought I would let you know that I have re-installed my multichanger as the weather is finally good enough and everything works fine(don't know how long for but it works at the moment) So a big thank you to Dave DND and all other contributers to this posting.

[Dave DND]

Just thought I would let you know that I have re-installed my multichanger as the weather is finally good enough and everything works fine(don't know how long for but it works at the moment) So a big thank you to Dave DND and all other contributers to this posting.

A pleasure  8-)