Fabric Color Changes in Polyester Micro-fibers Caused by the Multiple Reuse of Dispersed-dyes Dye Baths. Part II

Abstract

In a recent article we studied the fabric color change with three dispersed dyestuffs in monochromes (C.I. Disperse Blue 56, C.I. Disperse Yellow 211 and C.I. Disperse Red 167:1) when 100% polyester micro-fiber dye baths were reused several times. In this article we analyze the fabric color change in binary and ternary mixtures of those dyestuffs using different concentrations, but keeping the same shade. The color of the dyed samples is determined using colorimetry on the basis of the samples' reflectance measurements in the CIELAB color space coordinates and the differences between fabrics dyed in reused dye baths and the standard fabric dyed in the initial dyeing process. We also calculate the fabric color estimation for every known concentration by using K/S for color mixtures (Kubelka-Munk theory) and it is compared with the color of the original fabric. The color reproducibility for the different shades is analyzed using the MCDM (Mean Color Difference from the Mean) equation, and the reproducibility is analyzed in the same way for the fabrics dyed from reused dye baths.