Pigment is a color, black or white high-dispersion powder substance that is insoluble in water and organic solvents. It plays a role in displaying color in ink. According to the source and chemical composition of pigment ingredients, it can be divided into two categories: organic pigments and inorganic pigments: inorganic pigments are composed of oxides of non-ferrous metals or some metal-insoluble metal salts, and inorganic pigments can be divided into natural inorganic pigments (minerals Pigments) and artificial inorganic pigments; organic pigments refer to colored organic compounds, which can also be divided into natural and synthetic categories according to their source. The commonly used organic inks for printing are basically synthetic organic pigments with complete colors and better performance than inorganic pigments. When printing, the requirements for ink pigments are high, especially the color purity, dispersion, light resistance and transparency. Usually, the color tone of the pigment of the color ink is required to be close to the spectral color, and the saturation is as large as possible. The pigment transparency of the three primary color inks (cyan, magenta, and yellow) must be high, otherwise it will greatly affect the quality of the printed matter. No matter what kind of pigment, it must have good water resistance, can be quickly and uniformly combined with the connecting material, and have good acid resistance, alkali resistance, alcohol resistance, heat resistance and other properties.

Connecting material is a chemical substance that is used to disperse pigments, give the ink proper viscosity, fluidity and transfer properties, and fix the pigments on the surface of printed matter through film formation after printing. The binder can be made from a variety of materials, such as dry vegetable oils, mineral oils, solvents and water, and various synthetic resins. The fluidity, viscosity, neutral acid value, shade of color, water resistance, and print performance during the use of ink all depend on the binder. The same pigment can use different binders to make different types of inks; the same kind of ink Because the connecting material uses different pigments, the same type of ink is still made. Because the connecting material does not have the ability to change the basic properties of the ink, the quality of the ink is not only related to the pigment itself, but mainly depends on the connection. material.

Filler is a white transparent, translucent or opaque powdery substance, which plays the role of filling. Appropriate use of some fillers in the pigment can not only reduce the amount of pigment to reduce costs, but also adjust the thickness and fluidity of the ink, and also improve the flexibility of the ink formula design.