There is no recognized method for the classification of pigments. The reason is that there are many kinds of pigments, the chemical composition is very different, and the uses are various. Therefore, which method is not ideal for classification.
The more common classification method is to divide the pigments into inorganic pigments and organic pigments according to their chemical composition. In terms of performance, inorganic pigments have good lightfastness, heat resistance, and strong hiding power, but the chromatogram is not very complete, the coloring power is low, the color brightness is poor, and some metal salts and oxides are more toxic. Organic pigments have diverse structures, complete chromatograms, bright and pure shades, and strong coloring power, but they have poor light resistance, weather resistance and chemical stability, and are more expensive.
Fluorescent pigments are divided into inorganic fluorescent pigments (such as fluorescent pigments used in fluorescent lamps and anti-counterfeiting fluorescent inks) and organic fluorescent pigments (also known as daylight fluorescent pigments): only substances with specific chemical structures can have fluorescent properties. However, these fluorescent colorants themselves often have inherent deficiencies in light resistance and solvent resistance. One way to overcome these inherent deficiencies is to fuse them into the framework of polymer materials through chemical or physical methods, and then further process them into pigments. The polymer material used for this purpose not only acts as a solvent for the fluorescent colorant, but also provides protection for the fluorescent colorant, thereby giving the fluorescent colorant better light resistance and solvent resistance.
