Does coloring the edges of CD's help the sonics?

According to web page you provided, "The edge of the beveled disc should be 0.2 mm." Since the edge of an unbeveled discs is around 1 to 1.3 mm, that 0.2 mm thickness is only about 1/5 to 1/6 of the original thickness. Probably best to leave a very slight edge so as not to cut oneself on the edge while handling and help prevent chipping.

So, half is not enough according to manufacurer. Edge should be beveled about 80-85% of the way through

The scattering occurs below the surface and when laser hits the edges of the pits and lands....

So it does not true the disc.

Actually, it does, or very nearly. The rotating arm/blade cuts a perfect circle, so the circle formed on the upper surface of the disc by the bevel is perfectly round. Enough mass is removed from the edge during circumcision that the disc should be much more balanced while spinning. You can ignore the little 0.2 mm nub left on the edge.

You guys BOTH need to do some homework.

(http://www.tweakaudio.com/EVS-2/CD_tweaks.html) Everything in the electromagnetic spectrum has a specific wavelength/frequency, and in most examples, can/will be either absorbed or reinforced by some other wavelength/frequency(if present). Red light is no exception, and it just happens that the wavelengths of green and black absorb red's. It comes back down to: If you can hear and appreciate the difference(given a system able to resolve it)- enjoy it! If not- DON'T!! Perhaps the wearing of green pantyhose would reflect something entirely different.......