Do I really need to tell you WHY I want to draw on rocks? Or wood? Or seashells? Just think up a reason that makes sense, and pretend that’s why.
Anyway, not every pen works well on the rough, porous surface of these natural materials. Sharpies bleed, and their their soft nibs quickly degrade. Microns simply don’t work, and neither do gel pens.
Faber-Castell Pitt pens, however, work aMAZingly well. When you’re done, that rock won’t even remember how it used to look when it was plain!
I decorated the rock above as a paperweight for my partner for our anniversary (he did not appreciate last year’s anniversary present nearly enough, so this year he gets a rock). Although smooth, light-colored river rocks obviously work best as a surface for pen drawings, the Faber-Castell Pitt pens, with black ink, dispense ink well even on fairly rough natural surfaces, and the black is India ink, which shows up even on darker backgrounds.