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1. Lightly sand the outer and inner edge of the CD with sand paper (240 grit works fine) to remove the shine. This roughing of the edges stops a great deal of the laser reflections. This results in a more musical, natural and detailed playback.

2. Green or blacken the edges you just sanded and also green or blacken the top and bottom of the CD around the center hole where it is clear. Make sure you color into any centering grooves or hills. Because the laser is red everyone has assumed that you have to use a green marker to absorb the light. Black absorbs all colors and works very effectively. You want to use a marker that is opaque, doesn’t come off on your fingers and also does not peel off. Surprisingly cheap and effective is your basic black Sanford Sharpie marker. With this marker you need to go over each area several times to make it opaque. Doing this will give you even better sound.