Alright, I am an artist who *loves* brush pens. When I work digitally, I mostly use a red-black (actually, more of a pink-black) for lineart, but I couldn't find a brush pen that had a red-black. Until now. https://www.jetpens.com/blog/guide-to-brush-pens-for-comics/pt/879 However, this pen isn't refillable. Not only do I feel wasteful wasting a whole pen just because there are no inks to refill it with, but I also have significant environmental concerns. I work with Copic markers (which are alcohol-based), so I was wondering if there's some ink out there that is pink-black or red-black and is completely alcohol-proof (no smearing at all when really rubbing into it with alcohol). If not, is there any way I could make an ink like that myself?