Colorants include pigments and dyes. The pigment can give the ink different colors and color density, and make the ink have a certain viscosity and dryness. Commonly used are azo and phthalocyanine pigments.
The bonding material is made by dissolving a small amount of natural resin, synthetic resin, cellulose, rubber derivatives, etc. in dry oil or solvent. It has certain fluidity, so that the ink will form a uniform thin layer after printing, and after drying, it will form a thin layer. A film with a certain strength, and protects the pigment, making it difficult to fall off.