The physical properties of organic pigments.

Organic pigments have bright colors and strong tinting strength; they are non-toxic, but some varieties are often inferior to inorganic pigments in light, heat, solvent and migration resistance.

The variety of colors varies endlessly and colorfully, but there is a certain intrinsic connection between the colors. Each color can be determined by three parameters, namely hue, lightness and saturation. Hue is a feature in which colors are distinguished from each other, and is determined by the chromatographic composition of the light source and the sensation of the wavelength emitted by the surface of the object to the human eye, and distinguishes characteristics such as red, yellow, green, blue, and purple. Brightness, also known as brightness, is a characteristic value that indicates the degree of change in the surface of an object. By comparing the brightness of various colors, the color has a distinction between this and darkness. Saturation, also known as saturation, is a characteristic value that indicates the color of the surface of an object, making the color bright and hazy. Hue, lightness, and saturation make up a stereo, and with these three scales, we can use numbers to measure color. The colors of nature are ever-changing, but the most basic ones are red, yellow and blue, called primary colors.