Pigments are classified into two categories: organic pigments and inorganic pigments. Inorganic pigments are mainly oxides or some metal salts, etc., the main categories are sulfates, oxides, silicates, chromates, sand borates. The advantage of Inorganic pigments are that they have excellent light stability, thermal stability and light stability and lower in price.They are usually consumed in large quantities by downstream industries. But the disadvantages of inorganic pigments are that they don’t have many varieties and they are poor in brightness, and coloring power.
In the early twentieth century, synthetic organic pigments first appeared and the types of organic pigments are very much with 100 years development. In the dyestuff index, 800 of the registered chemical structures are organic pigments. And by adjusting the crystalline form and dosage, various types of organic pigments are sold in the market, such as: Pigment Blue 15:3, Pigment Red 112,Pigment Yellow 74, etc. Organic pigments have bright color, high tinting power, low relative density and complete chromatogram. but they are generally inferior to inorganic pigments in terms of heat resistance, weather resistance and hiding power. And with the development of organic pigment technology, the shortcomings like low heat resistance, hiding power and weather resistance have been greatly improved, so the application fields of organic pigments have been further expanded.