CD Media comes in different finishes on the top: painted silkscreen, unpainted shiny silver, frosted matte.
Those 3 are the main types one will encounter.
I have tried a Sharpie Fine Point, a TDK CD Mark (Ultra-Fine), A Staedtler CD Mark and a long ago pen since worn out.
The sharpies seem best only for shiny smooth surfaces.. on frosted surfaces I see a bit of bleed. They are ok on silkscreen too. The ink on this appears to apply deeply but as it dries you can slightly see a bit of 'fade' in the middle.
The TDK CD Mark seems best only on silkscreen and frosted, and terrible on shiny. Ink application deepness totally depends on the surface, some are better than others (silkscreen being best)..
The Staedtler which I can't seem to find on my desk and which has had it's tip ruined by someone who thought it was a normal pen and used it as such, seems to be good on all 3 surfaces based on looking at past discs from long ago. The ink on this from what I can see seems dark and rich.
There are other brands on the market now, like Memorex, etc. How do those compare?
I'm also wondering what colour people think is best. If the top of the CD is silver, do you prefer a nice blue, black or another color?
What if the CD surface is another colour like gold?
Also, what tip? I think the Sharpie fine point is too 'broad' while the TDK Ultra-Fine is a little too fine.. an in-between would be good.. from what I can see, I did have this in-between once.. It was my first pen that I don't remember the maker for, the Staedtler might be ok too maybe if someone doesn't ruin the tip.
The CD pen, the underappreciated part of burning.