$2 permanent marker does the same job.
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07-23-12: Marakanetzyeah, I want to know the answer to this question as well. I.E. what is the figure of merit to know which pen colour is better?
Did you measure the amount of reflection from each colour? OR, did you shine the laser on the line of colour & observe how much the laser light twinkled?
I used to use a permanent marker pen on my CDs. Upgrades made this practice redundant and I removed the marker with alcohol.
A word of caution. A problem arose when the spin of my transport caused some of the color to appear outside the transport drawer. I suspect the same thing could be happening on the inside of the transport, as well. Besides the issues of cleanliness and possible damage to the mechanism there is the issue of resale.
In my 20 yr $4 mil(just kidding) test program for some reason it seems to me that the cd's that are not see through, or have a good light block by the label side do not benefit from my cd mat. The others that you can hold up to the light and easily see light through them are benefited quite a bit from my cd mat. Painting the edges I never noticed improvement. Micro smooth from mapleshade I did notice improvement also. Thats just me though, my ears are weird, I look funny and I think I live in a crooked house, and I feed my dog human food sometimes.