I originally found my CDs sounded slightly less harsh (less high frequency gruunge) when painted with a common green paint Uni Posca paint pen.
I used those for a few years, then graduated to common green Sharpie pens. Then to black Sharpie pens.
ALL my CD and DVD outer edge are covered with one of the three.
I have never noted any difference between the three types.
As for multi colors I will pass. i am certain some folks find different colors affect the sound. I am not intereted in finding out.
I would not waste a nickel to see if a purple or orange affects the sound.
And NO I am not even slightly curious to try it.
I used those for a few years, then graduated to common green Sharpie pens. Then to black Sharpie pens.
ALL my CD and DVD outer edge are covered with one of the three.
I have never noted any difference between the three types.
As for multi colors I will pass. i am certain some folks find different colors affect the sound. I am not intereted in finding out.
I would not waste a nickel to see if a purple or orange affects the sound.
And NO I am not even slightly curious to try it.