Organic pigments have bright colors and strong coloring power. Non-toxic, but some varieties of light resistance, heat resistance, solvent resistance and migration is often less than inorganic pigments.
The breed change of color is endless, flowery and colorful, but there is certain immanent relation between all sorts of color, each kind of color can use 3 parameter to decide, namely tonal, lightness and saturation. Tonal it is the characteristic that color differs each other mutually, the decision depends on the chromatographic composition of illuminant and the sense that each wavelength that object surface emits to the human eye produces, can distinguish the characteristic such as red, yellow, green, blue, violet. Lightness, also known as brightness, is an eigenvalue representing the change in the lightness and darkness of the surface of an object. By comparing the lightness of various colors, colors can be distinguished from brightness and darkness. Saturation, also known as chrominance, is the characteristic value that indicates the intensity of the surface color of an object, making the difference between bright and dark colors. Hue, lightness, and saturation form a solid, and using these three scales, we can measure color with Numbers. The colors of nature vary greatly, but the most basic colors are red, yellow and blue, which are called primary colors.