Fw artists ink is an acrylic based pigmented water resistant ink on most surfaces in a range of 38 colours all of which have either a 3 or 4 star rating for permanence such a high degree of lightfastness 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