What's the deal with coloring CD's and/or tray mechanism

Green indicates other visible wavelengths of light from longer red to shorter blue are absorbed and only green reflected. That’s why you see green. Green is not the complimentary color of red. That would be blue + red which is magenta. So any conclusions based on this incorrect info cannot be correct. It would help to get the science of light correct first before attempting to apply it. Also how visible light is absorbed or reflected indicates nothing about infrared which is longer wavelength than any visible light and absorbed or reflected independently.

You would think a former NASA scientist would know these things. Sheesh. Wikipedia is still your friend.

Also to absorb red light only the color you would see is cyan which is blue + green reflected and red absorbed. What happens with non visible light at longer or shorter wavelengths is again independent of what happens at visible wavelengths blue through green through red.

Even infrared is absorbed best by the black paint.

Kijanki I don't know.     Only that black if red through blue ie all visible wavelengths are absorbed.   In nature water absorbs  IR best and appears black in an image captured with IR frequency light. 

Black absorbs all wavelengths. Special infrared sinking paints, used by military, are all black matte. Cheap version, often used, is Krylon 1602. You can easily test it with infrared led (remote control etc) and cellphone (since they show infrared as visible light).  Thin layer of water would be completely useless.

This was a big deal in the early years of CDS to try to get them to sound better. I colored the outside edge and inner edge with different colors. They actually sold audiophile coloring pens to do this at a premium cost of course. Never really heard any difference. Don't waste your time
Alan