Daler-Rowney FW Acrylic Artists Inks are water-resistant, pigmented inks. Unlike dye-based inks, pigmented inks are resistant to fading. Each color has a three or four-star permanence rating. Such a high degree of lightfastness makes the inks ideal for creating permanent works of art. You can dilute FW Acrylic Inks to achieve subtle tones very similar to watercolor. The acrylic wash dries to a water-resistant film so you can paint additional layers of color. Daler-Rowney's FW Acrylic Artists Inks work best with airbrushes, technical pens and FW Markers. The Primary Set of 6 includes one FW empty marker, 6 x 1 oz bottles of Process Yellow, Crimson, Process Cyan, Process Magenta, White and Black.