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

In 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 ‎method‎