In this study, iron chloride solution ١٠٪ was used as absorbance matter which absorbs all dyes and the organic substances during its precipitation . The accumulation of these wastes in nature is considered to be a serious source of pollution and health hazard. We determined the optimal pH and the optimal dose of a minimom number of the reagent used as well as the water of dyehouse baths, and we compared the difference between using iron chloride and aluminium sulfate .We adopted the experimental observation in measuring the results and the strength of absorption within the spectrofield in a wave length of ٣٥٠ – ٧٥٠ nanometer .