63.16.50.235
In Reply to: RE: Stereophile posted by geoffkait on September 12, 2009 at 16:08:33
Some CD's have a circular depression just outside the spindle hole before the silvered section. Coloring in that depression has a similar effect to coloring in the spindle hole itself. That was reported in some magazine article I have long since forgotten.
Similarly the silvered layer acts a mirrored backing which the function of the flashing but since tha laser light is obviously scattered by the pits engraved it is no surprise that the laser light is then reflected along the entire disc on both sides: the bottom because of the obvious reflections and scattering against the air-plastic interface and even the top since some of this reflected light will penetrate the silvered section. Hold up most silvered CD's to a light: chances are you can see through the disc. The gold plated ones make excellent sunglasses and indeed the NASA astronauts used a gold flash on their space suit visors in order to reflect the harmful UV and IR radiation from the sun.
Any coloration due the principles of optics will absorb certain bandwidths of radiation being emitted from the laser. It ain't rocket science here.
Stu
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