This Koh I Noor drawing ink is primarily designed for drafting, drawing, and laying areas on tracing or drawing paper with a knife or tubular pen, airbrush, brush or dip pen. These drawing inks are not suitable for use in technical pens.
"The Colored Drawing Ink KOH-I-NOOR would be ideal for artists looking to deepen their pastel coloring or create vibrant, fade-resistant drawings."