Since dye-based ink contains water-soluble colorant, the colorant dissolves and smudges when coming in contact with water. With the Epson Epson Stylus CX4100's Epson DURABrite Ultra pigment ink, every ink particle is encapsulated with a soft yet extremely strong a protective resin. The results are prints with superb water-resistance to spills, humidity, and the moisture introduced by using highlighter pens and daily handling.