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Originally Posted by ridgeln
There have been reports of issues with the alcohol eating through the CD plastic and then affecting the dye that is what is changed when "burned." I've had CD's and DVD's become "bad" from too much exposure to light (the dyes used are photo sensitive). There are CD "safe" markers available that are water based ink.
-ridgeln
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I've been a big live-music trader for a long time and have CDRs with Sharpie-type marker writing on them that are 8 or 10 years old, and they still work fine (also negating the continuing stories on how CDRs will only last a few years - I just saw a new report today, in fact.) The alcohol in the markers dissipates within minutes leaving only the pigment behind. The likelihood of whatever caustic element is left actually hurting the disc is pretty low. I've also tried those water-based markers and they're pretty bad - they smear very easily. Not worth the trouble.