Sulphur dyes is mainly used for cotton dying, it can be returned to leuco sodium salt by sodium sulfide, after coloration and oxidation, it will be returned back to itself. Sulphur dyes are dark urually, such as blue, black, brown. It has great production and extensively using.

Direct dyes can put color to cellulose fiber by neutral weak base medium, it has various colors, from yellow to black, easy to be produced and is convenient to be used. Direct dyes can be used for knitting, silk, cotton, leather, wool, linen, adhesive fiber and papermaking etc.

Vat dyes is a traditional dyestuff for cotton dying and printing. Various and bright, complete chromatogram, good fastness, especially with high light fastness, excellent washing fastness. Vat dyes is dissoluble in water with good levelness, easy to be operated, not only used in cotton dying but also can be used in animal fiber dying directly.

Acid dyes is used in dying and printing of wool, silk, polyurethane fiber, and staining for leather, paper, ink,cosmetic etc.,complete chromatogram,bright colors, the dying process is in acid bath, so called acid dyes.

Solvent dyes is mainly used for fuel oil, petroleum products, ester, wax and its derivant; homopolymer resin and plastic; colourful fluorescence coating; metal surface; wood; varnish, ink, shoe polish, jacket polish, ball-pen ink etc. Solvent dyes can be used as functional dyestuff for solar energy trapper, light-sensitive material, optical disk, medicine tracing, chemical and biologic analysis, laser and other high technology.