I've had good luck with Bic medium point pens (on balls). There is definately a problem with some inks fading more than others, although most of the ones that I've seen were already light right after they were signed and then faded even worse. On the other side, I've seen some inks that will turn more of an aqua color while still being fairly dark. The latter discription isn't even an environment or light issue since I've had a couple balls do that even when they were kept air and light tight for 20 years.
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