Walker's Copperplate ink dries matte. It's also decidedly black ... eventually. (I'm looking at a piece of writing I did about a week ago on unfamiliar paper and the ink looks just right now, including some uncharacteristically heavy shades. At the time it went on light grey, and I thought "here we go again - invisible ink", but after a few minutes it was an unappealing shade of mid brown. This stuff reacts instantly on Rhodia but with some papers it can take several weeks, making it less than ideal for correspondence). Anyway, Schin can advise on the American equivalents which I guess would be Old World or McCaffrey's. In my experience all iron gall inks write nicely, but nothing's perfect and judicious matching of paper to ink is a must if you're in a hurry.