Application of the Ratio Derivative Method in Quantitative Analysis of Samples Dyed with Ternary Dye Mixtures

n this study, a derivative method is applied for the determination of dye concentration in fabrics dyed with tricomponent dye mixtures. The reflectance of spectra of the samples were recorded between 400 and 700 nm. Initially, the obtained (K/S) spectra were divided by the spectrum of a standard sample dyed with two of the components in the ternary mixture and the derivative spectra were calculated. Then, the amounts of the dyes were determined by implementing or carring measurements in suitably selective wavelengths in the required spectra derivative ratio. Results indicated that the developed spectra derivative ratio (K/S) method is more accurate than the normal Kubelka-Munk.