Re: [JFW] JFW and Roxio CD Label Creator
- From: Chris Smart <chris_s@xxxxxxxxxxxx>
- To: jfw@xxxxxxxxxxxxx
- Date: Tue, 29 Jun 2004 14:38:26 -0400
At 02:13 PM 6/29/2004, you wrote:
>Dye is not used for recording CD's. The data is burned into the foil
Please see:
http://www.mediastore.com/cdr/cdr_faqs.asp
I'll quote a bit below.
If dye is not used to facilitate recording, why then do we call it
recording dye?
What is the difference between gold and silver and blue CDRs (when viewing
from the bottom)?
Most importantly, gold CDRs are no longer being made. Silver CDRs are the
premium CDR in the industry and years of experience tell us that the best CDRs
are Mitsui Silver. Blue CDRs are a widely mixed breed. You will find
bluish-grey, greenish-blue, bluish-purple, greenish-grey, and more, but the
best test
is to hold the CD up to the light and see how translucent or see-through
that it is compared with others. Generally, the more see-through discs have
less
recording dye and are of a lesser quality. We recommend the more opaque
disc, whether it is silver, green, blue, or whatever.
Q:
A:
Why are different manufacturers' discs different color green (or blue)?
The color of the CD-R disc is related to the color of the specific dye that
was used in their recording layer of the disc. This base dye color is modified
when the reflective coating is added. Some of the dye - reflective coating
combinations appear green, some appear blue and others appear yellow. Visual
differences between various media types are irrelevant from the standpoint
of their actual operation. At 750 nm, where CD-R recorders and CD-ROM readers
function, the media are, for all intents and purposes, indistinguishable
from an optical standpoint. They all "look" the same.
Q:
A:
What are the differences/benefits between cyanine, phthalocyanine and azo dyes?
There are a number of important recording characteristics associated with
each dye and reflectivity coating combination as well as some longevity issues.
Each media manufacturer strives to balance the engineering characteristics
of the dye to insure greater compatibility with recorders and readers and long
archive life. In addition to cyanine and phthalocyanine, there is also azo
dye. Cyanine dye and its metal-stabilized derivatives were originally used
because
the Orange Book, Part l referred to the recording characteristics of
cyanine-based dyes in establishing CD-Recordable standards.
So, dyes based on cyanine tend to have a wide range of acceptable recording
power levels and recording speeds. The phthalocyanine dye is a newer dye that
appears to be less sensitive to exposure to light after recording so that
longevity has been improved. Azo dye has been used in other optical recording
media and is now being used in CD-R. The media manufacturers use these
different dyes in combination with dye thickness, reflectivity thickness
and material
and groove structure to fine tune their recording characteristics for a
wide range of recording speeds, recording power and media longevity. Over time,
there has been a steady convergence in the properties of the various dyes
used for CD-R.
...
Thanks for the mention of the Word template for printing labels. that is
probably much more accessible than the dedicated labeling programs.
Chris
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