y.................
...			Pigment is a finely ground substance that shares its color effects when mixed with a liquid vehicle to create paint. Pigments used in all media are the same although not every pigment is easily incorporated into each medium.
Two customary classifications of pigment are Inorganic (mineral) and Organic (vegetable or animal) including those artificially prepared. They are also divided into the categories of transparent and opaque. Pigments are usually named for their resemblance to natural objects, inventors, places of origin, intended purpose or composition. Cobalt Blue for example, derives its name from "Kobold" (Goblin of the Mines) because the reflection from its crystals resembled goblin eyes to silver miners.			...
Pigments used in artists' colors must meet stability and permanency requirements when exposed to mediums, light and air and must be carefully tested for quality and safety. All pigments are not created equal and while many commercial grades conform to basic requirements for artists' colors, only a few are capable of producing the attributes of brilliance, strength and permanence that distinguish true artists' quality color.