..., the wastewater from the dye bath is reused for wool dyeing. For the spectrophotometry study, the absorbance spectra of the dye solution are measured by a spectrophotometer. Then, the absorbance values of the dye solution are used to determine the dye concentrations in the wastewater of the dye bath...

...P. M. Chan; C. W. M. Yuen; K. W. Yeung Attempt has been made to extract the dyes from waste materials such as simulated tea waste and applied it in wool dyeing. In this paper, the central composition experimental design of multivariate Response Surface Method was used to formulate mathematical...