Ink drawings have a long history amongst artists. It has great covering properties along with resistance to ageing, and you can combine these pens with other painting methods. This has always been an interesting medium for artists and graphic designers. These Pitt Artist Brush Pens are excellent for colouring, sketching and mixed media. Each Pitt Artist Brush Pen uses the finest quality, permanent Indian ink, which is acid free and archival. The Waterproof ink incorporates high quality pigments with unsurpassed lightfastness. The quality brush provides flexibility for sketches or detail work. - Faber-Castell Pitt Artist Pen Brush Skin Tones - Pigmented India ink - Waterproof, permanent