Only ordinary dye-based ink will run if the paper gets wet. It is easy to find either roller pens or ink for fountain pens that are pigment-based, lightfast an

Only ordinary dye-based ink will run if the paper gets wet. It is easy to find either roller pens or ink for fountain pens that are pigment-based, lightfast and waterproof. It is very easy to test yourself that with such ink water has no effect whatsoever over the written text (after a minute or so of drying after writing). For example, there are many kinds of Uni-Ball roller pens with waterproof ink, but there also many other brands with similar products. (Only fountain pens, roller pens and gel pens may have pigment-based ink, the paste ink used by ball-point pens is easily washed by alcohol or other organic solvents.) In my experience with graphite on paper, it is a much worse choice, because the writing will fade over the years, due to the rubbing of the paper sheets from each other. The pigment-based black inks also use carbon, like graphite pencils, but any ink contains not only a pigment, but also a glue that binds the pigment to the paper, so it will not be rubbed out by touching it.