Thanks. Some Copics are archival (multi liner) but the standard ones aren’t as far as I know. In fact, I hear they’re pretty poor in regard to fading with or without light. The Copic multi-liner pens don’t take well on the paper — they don’t dry.

Anyway, I’m experimenting with some other options now. The Pentel Hybrid Technica archival/pigment pen seems to work, but the larger nib doesn’t put down ink as well as the finer nibs (for some strange reason). But the acid-free fine-point paint pens would work if they were so opaque and think. No bleeding or anything like that… it doesn’t show through unless you hold the print to the light and look through it.