I'm somewhat puzzled by the proscription not to write on CDs
with markers such as the Sharpie, which use some kind of non-alcohol
solvent. As I understand it, the CD is a thick layer of plastic,
a thin layer of dye, a thin layer of metal, and a thin layer
of lacquer to protect the metal. A solvent-based marker could,
perhaps, soften or slightly deform the layer of lacquer (until
it hardened again), but I don't see how that would affect the
metallic layer beneath, or the dye layer beneath that. If the
dye layer and the metallic layer are unaffected, what is the
presumed risk of using these commonly available markers? Unless
the marker completely exposed the metallic layer or scratched
it, once the marker dried, there would once again be a layer
of lacquer protecting the metal, which in turn protects the dye.
- David
= = = Original message = = =
Julian,
I doubt that *anyone* (and I include the manufacturers here too)
really
knows for sure what will or will not be safe over time. Probably
the
only information you'll hear is going to be nothing but opinion.
Lacking any solid information on this, I have settled on the
same
solution Andrew Darlow mentions - I write my disk ID number (which
is
also used as the recorded disk label) on the clear inner ring
with a
medium point Sharpie. There's no way it can affect the data layers
there. I think that's as safe as it can be, given the lack of
conclusive
information available.
Cliff Ober
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