Properties of vat dyes

(1)     Water insoluble dyes.

(2)     Needs vatting for application.

(3)     Needs oxidation for final color development.

(4)     Excellent color fastness properties (wet, light fastness)

(5)     Applicable for cellulosic fibers.

(6)     Wide range of color can be produced, specially for blue and green color.

(7)     Expensive dyes compared to other dies.

(8)     Applied, in al alkaline condition

(9)     Applied for high quality items.

Textile dyes:

Dyes are coloring unsaturated organic substances have been used for the coloration of textile materials. Most of the dyes are water soluble. A dye molecule consists of there 3 parts such as:

(1)    Chromophore groups - Color bearing part or group of dye molecule

(2)    Auxochrome groups - Color helping group which determines the properties of dyes

(3)    Chromogen groups - Hold the structure of dyes