On 19/08/04, Mike Richter wrote:
> The black pigment (or blue or red or amber - all have been available)
> is in the otherwise clear layer below the dye layer. Unlike
> anti-halation, its absorption occurs before as well as after the light
> strikes the sensitive dye. The pigment has proved to be of esthetic
> value only. Fortunately, it does not do any measurable harm except for
> a negligible increase in the power setting effected in calibration.
I have only one black CD here, marked "Creation Optical Media".
I cut a sliver off the centre hole and examined it on a lightbox. The
dye is in the plastic - it is definitely black polycarbonate.
The other colours might be just layers. I haven't seen them.
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