DED outdoorsman is the best outside ink ive used(expensive though). But their inside-job is nothing to special considering how many hard staining "Hard to Buff" alcohol based ink are available. For insides i use my own recipe, mix of denatured alcohol, garvey LIKE ink from an old cashregister, genitian violet, RIT violet/black. pilot ink and dot3. Its a hardstainer and i just like the color violet.