Inkjet printers use two kinds of ink to suit different situations. Pigment inks contain colored particles in suspension. The non-soluble particles bond quickly with the paper leaving bold prints that are less prone to smudging, running or fading under UV light. Pigment ink works well with smooth high-quality paper and is ideal for text documents. With dye-based inks, the colorant is in solution so it needs to soak into the paper and the prints are more susceptible to running and less UV resistant. Dye works well with cheap paper and also coated photo paper thereby making it ideal for photos. Many inkjet printers use both black pigment ink and colored dyes in combination.