There are many benefits to choosing and using artist paints that contain only one pigment, are pre-mixed and are referred to as 'hues'.  You can gain accuracy, save time and most importantly - money.

Single Pigment Artist Paints
The best results in painting come from use of colors based on just one pigment, as opposed to a mixture of multiple ingredients or pigments. A single-pigment color will mix truer and more predictably, and will give the benefit of maximum chromatic intensity possible for that pigment.

Convenience or Pre-Mixed Paints
Pre-mixed artist colors save time, labor and expense by offering shades and hues intended to anticipate the natural mixing habits of painters. Try introducing a new mixture into your palette to blend new tones or subtleties into your next work of art.

Artist Paints that are "Hues"
Colors with a familiar name followed by "hue" (Cadmium Red Hue, Cerulean Blue Hue) are mixtures intended to approximate the properties of a more costly or pure color. Generally, a color designated as hue-equivalent will have a mass-tone close to the original; however, in mixtures these alternatives perform with less vibrancy. Since the final color is composed of different amounts of two or more pigments, mixing on the palette can overwhelm the weaker component, with results substantially different from what would be expected with the genuine color.

Hue equivalents offer some advantages, if the paint is to be used more or less straight out of the tube with little or no mixing, results can be very good. As familiarity with this category of paint increases through practice, most artists find which of these economical alternative "hue" colors are best suited to their needs.