Fountain pen ink is the liquid that fills fountain pens and should not be confused with drawing ink. Drawing inks are made from dye, while fountain pen ink is a suspension of pigment particles or stains in water. Some fountain pen companies also manufacture bottled drawing ink for dip pens and brushes. These are usually labeled as drawing inks or calligraphy inks. Drawing ink should not be used with fountain pens because it is too thin and will flow through the fountain pen feed uncontrollably, causing leakage and stains. Drawing ink may also dry out inside a pen, clogging the nib. In addition, some drawing inks have corrosive properties that may damage pens. Drawing inks are also not lightfast, which will fade when exposed to light. Many different bottled fountain pen ink brands are available today, and a vast array of colors from which to choose. In addition, professional writers and artists have developed many 'specialty' inks, such as iron-gall, bulletproof, or water-resistant. Some inks, such as the Sailor brand, are also scented in Japan.