THE thing about RW media is that the difference between reflective and non-reflective, the "1" & "0", is the difference bwteen the melted metal layer being in it's amorphous (non crystaline) state
OR it's crystaline state.
the difference is accomplished not by the way the alloy melts but how the alloy is allowed to "freeze" with the burning laser shining on it.
The real bitch of the stuff is that given long enough the
"amorphous" alloy filled pits in the disc wil gradually over time turn to the more natural crystaline state thus erasing the data.
There is no "dye" it's all done with this special (and complex)
Quality of the disc doesn't help, storage under ideal conditions only prolongs the inevetible.
the data WILL disappear given enough time.
write once "R" discs deteriorate slowly but their storage life can be extended greatly by storing them somplace cool, dry and dark.
With RW discs...
Don't depend on them for long term storage, HOWEVER if you periodically copy the data off of them onto a HDD, then write the disc again... and do this say... every six to nine months...
You won't lose a thing and the discs, even the cheap ones can be rewritten 1000times, some of the better ones as much as 10,000 times.
I use CD-RW's in the CD-changer in my car, mostly because I run compliations discs
stacked with mp3's and after playing for a while I decide that some thigns don't "fit"
so I erase and rewrite the disc... until I'm "happy" then I burn an "R"
It saves money in the long run.