Pigment refers to the substance that can make objects colored. There are soluble and insoluble pigments, and there are differences between inorganic and organic pigments. Inorganic pigments are generally mineral substances. Humans have long known to use inorganic pigments to paint and paint their bodies on rock walls using colored soil and minerals. Organic pigments are generally taken from plants and marine animals, such as indigo, gambog and purple extracted from shellfish in ancient Rome.

A powdered substance used for coloring. It is insoluble in water, grease, resin, organic solvent and other media, but can be evenly dispersed in these media and can make the media colored, and has a certain covering power. The basic requirements of pigments used in art are that the finer the particles are, the brighter the color is, and the longer the color is, the better the stability is. Watercolor pigments are almost transparent except white. This can meet the needs of watercolor cover dyeing.