Basic dyes, also known as salt-based dyes. Dyes that produce cationic dyes can be dissociated in aqueous solution and classified as cationic dyes. It is characterized by bright color, strong fluorescence (mainly rose, yellow, orange, etc.), strong coloring power, less dye usage and rich color. It has poor color fastness and light fastness, but it has good fastness to acrylic fibers (polyacrylonitrile fibers). The basic dye does not color the cellulose fibers.