How many do"green edge"an silicon up CDs

The best CD treatment system is Auric Illuminator which does seem to consistently make a slight overall improvement.
This includes a black edge marker and polishing gel combination. Edge marking alone does not offer a noticeable
improvement to me. Before you become obsessed with tweaking Cds you must get duplicate CDs to compare treated vs untreated version to really see if any improvement is occuring, otherwise it is easy to convince yourself that you hear an improvement when usually there is none.

And of course NEVER apply any tweak to your CDs which cannot be completely removed, or you will reget the day
your valuable CD collection was altered.

One more caution about edge marking, even though the black
marker used in the Auric Illuminator kit can be removed with
isopropyl alcohol, some CDs have elaborate artwork covering the entire surface of label side. These can have delicate
matte/gloss surface coatings which will be damaged by any alcohol contact no matter how careful you are! Usually when you mark the CD edge, a small amount of marker will be deposited on the label surface edge.

I am not sure if green marker is removeable, but this is a consideration if you ever plan to resell CD in the future,
if you need to return CD to like new condition.