Data layer colours of discs?


#1

Factory-pressed CDs, DVDs and BDs look nearly identical.

CD-Rs are yellowish/greenish, while DVD-R has a beautiful red dye. Sometimes, it is also dark cherry red (eg. GSC003).

Why does that beautiful dye look different for each manufacturer? Does it depend on the maximum speed? We also have some old Speer DVD-R’s with ×4.

DVD+R looks rather purple.

DVD-R DL looks red, sometimes even brown, while DVD+R DL looks blueish red (XLynq looks blue).

BD-R looks as dark as CD-RW/DVD-RW/DVD+RW.

DVD-R/RW has a small ring at the inner data edge, that is missing on DVD+R/RW.

In 2012, in Iran, I also saw a black and a red CD-R. I wonder, how they were made. The red one looks like a DVD-R.


#2

The CD-Rs can be of almost any color. The manufacturer only has to use a colored polycarbonate instead of a transparent one, there is no other difference in the manufacturing process.

By the way - if you are from Iran - do you know whether there is still any active CD-R/DVDR manufacturer in Iran or neighbouring countries?


#3

Thank you for your information.

I live in Germany, but my parents are Iranian.
Some Iranian manufacturers are:

  • EpochCD
  • Cup
  • ToPrinCover (Princo?)
  • PrincoBudget
  • MeDisk/OmeDisc
  • PlasMon

I am not quite sure, how many are active. They most likely are.
Why are you asking? :grinning:


#4

I am just wondering how many non southeast Asian media manufacturers do still exist.


#5

What about DVD-R?
Can there be a green DVD-R?
Why is a DVD-R red/purple? (RITEKF1 and GSC003 have beautiful tones).


#6

I asked the similar question (“Is it possible to manufacture DVDRs using colored polycarbonate?”) the former owner of 3A Media in 2009 and here is his answer:

Yes, but this was very critical, beacause there are many ways to colour the
PC. Most of them failed. We developed a special mixing/drying hopper that
was mounted onto the moulder directly. This way we did not have to purge the
whole system when changing to other colours or back to clear PC.
The coloured PC impacts the laserlight similar to a filter and you have to
prevent the light to shift frequence or even to modify polarisation.
Very difficult. The black in fact is a very dark red. It absorbed a lot of
light, that´s why only 4x was possible.

AFAIK the 3A Media was the only manufacturer who ever commercially (albeit in a very limited numbers) released colored DVDRs in 2004-2005.


#7

The days of colourful recording dye layers is more or less gone. CD-Rs use a light green phthalocyanine and DVD+/-Rs are more or less purple.


#8

What is the advantage of purple DVDs?
RITEK makes them strawberry red.
GSC003 is luxury dark cherry ambient red.


#9

Why exactly are they red/purple?
Xlynq DVD+R DL are blue-ish.
DL discs are darker red.
DVD RW is silver.
Tevion is purple.


#10

One can stick a foil, or not?


#11

DVDR dye cannot be of any other color than red/purple - there are deep and insurmountable technical reasons for that.
The shades can be different depending on the type and manufacturer of the dye.
Only ways to change the disc color is using a gold reflective layer (the bottom of the disc will then appear pink) or using a colored polycarbonate resin (this is costly and technically complicated and limits the disc recording speed to <4x).


#12

Also, dual layer discs are slightly darker.