I still need to color my AS&SH dice as well, hopefully before Gary Con. I want to use them in one of the AS&SH games. :-)
Nice. The alternative is to try a Pilot ultra fine point permanent marker. Now for the really light dice -- our yellows, clears, oranges, and maybe reds, black is a good choice. For the darker dice -- the purples, charcoals, greens, I think silver looks best.