We are surrounded by color. Color is dependent on light. Without light there is no color. So what happens to the purple carpet when the light goes out? Is it still purple?
Yellow is one of the three primary colors (the others being blue and red). Purple or violet is a secondary color and formed by mixing the two adjacent primary colors (blue and red). This needs really accurate mixing, a clean brush and water and pure color paint to achieve a really good color.
Color is extracted from many substances around us that yield pigments. Pigments are pure colors in powder form and they must be suspended in a medium such as oil in which they are insoluble to make them viable. Better quality materials will usually contain more concentrated pigments and therefore produce greater intensity of color.
Dyes on the other hand are soluble compounds dissolved in a liquid. They flood beautifully on paper and form the base of other media used in some of the samples illustrated.