Hi,

I would like to know are there any differences between the different color , on the bottom side, of a CDR?

Are they differ by quality or what?

thx

its the type of dye they use
i think there is about 3 types

Here are some sites that will help your understand the different quality dyes m8:

http://www.cdmediaworld.com/hardware/cdrom/cd_quality.shtml

http://www.cdmediaworld.com/hardware/cdrom/cd_dye.shtml

Thx,

My friend told me that he saw a dye of color, BLACK , on a CDR..!?!?!?

Is it ture? I don't see the post mentions black color dye....

thx

There are black CDR's but the dye used isn't black.

oh. So what kinda dye is that?

Is the black CDR's any good?

you can't tell if a cd is good by looking at the colour of the disc. Colour of the disc is just aesthetics and nothing to do with quality. Some people buy black cd'rs for burning playstation games so that they look like an original.

here's a very useful site for you M8, should take up a weekend, dont think that info is quite right cdcloner

http://www.cdrfaq.org/


Info on Dyes for you

The basic building blocks of CD-R media are organic dye and a reflective layer. The dye types currently in use are:


cyanine dye, which is cyan blue in color (hence the name);
phthalocyanine and "advanced" phthalocyanine dye, which have a faint aqua tinge;
metalized azo, which is dark blue; and
formazan dye, which is light green.
The reflective layer is either a silvery alloy, the exact composition of which is proprietary, or 24K gold.
Discs come in many different colors. The color you see is determined by the color of the reflective layer (gold or silver) and the color of the dye (light blue, dark blue, green, or colorless). For example, combining a gold reflective layer with cyanine (blue) dye results in a disc that is gold on the label side and green on the writing side.

Many people have jumped to the conclusion that "silver" discs are made of silver, and have attempted to speculate on the relative reflectivity and lifespan of the media based on that assumption. Until an industry representative issues a statement concerning the actual composition, it would be unwise to assume that the reflective layer has any specific formulation.

Taiyo Yuden produced the original gold/green CDs, which were used during the development of CD-R standards. Mitsui Toatsu Chemicals invented the process for gold/gold CDs. Mitsubishi developed the metalized azo dye. Silver/blue CD-Rs, manufactured with a process patented by Verbatim, first became widely available in 1996. According to the Ricoh web site, the silver/silver "Platinum" discs, based on "advanced phthalocyanine dye", were introduced by them in 1997. They didn't really appear on the market until mid-1998 though. Kodak Japan holds the patent on formazan dye.