Dr. Ph. Martin's Black Star India Inks are lightfast, permanent, and waterproof when dry. This matte finish ink will not reflect light, making it ideal for use on paper, illustration board, and canvas. It produces excellent results when used with technical pens or calligraphy dip pens. Flows through a 4x0 (0.134 mm) pen tip. While extremely opaque, this ink contains no varnish or shellac.