FW Artists Ink is an acrylic based pigmented water resistant ink in a range of 38 colours, all of which have either 3 or 4 star rating for permanence. Such a high degree of light fastness over such a range of fully intermixable colours makes them ideal for use by artists in the production of pictures for permanent display. Equally, however, colours can be substantially diluted to achieve the most subtle of tones, very similar in character to watercolour. Such washes will dry to a water resistant film and successive layers of colour can be overlaid. FW Inks work well through airbrushes and technical pens.