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

Don Cox wrote:
> On 09-Aug-02, Steve Green wrote:
> > I didn't intend to jump into the fray and still don't have time to
> > pursue this further, but I would like at least to disagree about the
> > relevance of UV and heat. I would have to say that regular window
> > glass is not "opaque to UV." One has only to walk past a bookstore
> > window on Main Street and see all the book jackets completely faded to
> > realize the effect of sunlight on printed materials. I'm not prepared
> > to say how it might affect CD-R dyes.
> The backs of most of my books at home are faded likewise.
> However, the cyan ink is always the least affected - it is the magenta
> and yellow that fade. CD-Rs use cyan dyes which presumably are
> chemically related to the ones in printing inks (phthalocyanines).
> So CDs should be less sensitive than book jackets. I would still keep
> them away from direct light.
> Regards
> --
> Don Cox

These effects are related to the spectrum of sunlight that is rich at
the IR and red end, strong in the yellow, and weak in the blue and UV

Definitely avoid lengthy exposure to sunlight of CD's, print material,
fabrics, etc. CD's are affected not only by direct optical irradation,
but also to heating caused by absorption of sunlight. However, CD's may
be more tolerant than may inks and dyes.

Media Sciences

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