Sennelier Black Indian Ink is a beautiful, deep black ink that is indelible and lightfast. When diluted with water it becomes less indelible. Excellent for dip pens, brushes, and airbrushes it can be used for a range of techniques calligraphy, drawing, illustration, and flowing washes. Not recommended for fountain pens. Perfect for artists, illustrators, and designers, Sennelier Indian Ink provides intense, permanent black tones with a traditional, long-established formulation.