Re: CDs, was DATs, Was Re: arsclist Duplicating casette tapes

[Mike Richter <mrichter@xxxxxxx>]

At 02:06 PM 8/9/2002 -0700, Steve Green wrote:
> Well, that's a good point Steve. I believe it was the lacquer side, not the
> clear polycarbonate side. Not sure how that might affect the outcome. I
> guess the dye layer could be affected more if the clear side were facing
> out, yes? But since the disc is essentially "transparent" would it really
> make a difference?

The metal layer reflects, hence is nearly opaque to, the infrared light 
used to read and write the disc. I don't know about its UV transmissivity, 
but I'd have been surprised if the test you described would have shown ill 
effects.

With some dyes, even moderate sun exposure can bleach them in the visible. 
Indications are that that also erases the information in the IR.

Mike

mrichter@xxxxxxx
http://www.mrichter.com/


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