rOtring Isograph Technical Drawing Pen, Liquid Ink, 23 ml, White This is an easy-flowing, high opacity ink with excellent adhesion, suitable for tracing paper, vellum, drawing paper and lineboard. Calligraphy nibs, crafted from the finest stainless steel and hand finished for a smooth, precision inking edge. It's lightfast and suitable for all forms of reproduction. Ink has high color purity. Colored inks can be mixed with one another. Calligraphy nibs, crafted from the finest stainless steel and hand finished for a smooth, precision inking edge. Not for any use on skin, including tattoos.