FW Artists' Ink is an acrylic-based, pigmented, water-resistant ink in a vast range of colors, all of which have either a three-star or four-star rating for permanence.
Such a high degree of lightfastness over such a range of fully intermixable colors makes them ideal for use by artists in the production of pictures for permanent display. (Note – Fluorescent colors are not lightfast.)
Colors can be substantially diluted to achieve the most subtle of tones, very similar in character to watercolor. Such washes will dry to a water-resistant film and successive layers of color can be laid over them in a highly predicable manner.