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Re: [ARSCLIST] CD markings
On 30/09/04, Mike Richter wrote:
> It is not appropriate to assume that the alcohol in the ink is the
> only culprit. In two cases with which I'm familiar, silk-screen ink
> itself migrated through the acrylic lacquer.
Which component(s) of the ink?
> The extra added point - not needed numerically given the shopping list
> Steven provided already - is whether pressing the archival disc is
> worthwhile. That is, we have assumed that pressed discs have longer
> life than recordable ones, though as far as I'm aware there is no
> clear evidence of that. However, if that is so, why do we assume that
> archival storage would be on recordable media? The added cost of $500
> or so per disc is not an issue in the world of idealized archiving.
> Perhaps more significantly, pressing allows for distribution of the
> master (each pressed disc is such a master) to 500 or so archives to
> preserve it against the ravagaes of time and the losses of natural and
> man-made disaster.
It ought to be possible to make a writable disk system which made
physical dents or bubbles in the polycarbonate, rather than using a dye.
This would need a higher power laser - which in turn makes the disk more
oblivious to ordinary sunlight.
Regards
--
Don Cox
doncox@xxxxxxxxxxxxxx