Color and fastness study of wool dyeing in multiple reuse dye baths using acid and reactive dyestuffs in laboratory scale

The possibility to reuse residual dye baths for wool dyeing with acid and reactive dyestuffs (Blue Marine Irganol 2RLS and Blue Lanasyn BLS, respectively) was investigated in this study. The residual dye baths were reconstituted and reused 20 consecutive times for dye concentration of 1%. A series of colorimetric measurements were carried out for the obtained samples in order to evaluate the conformity and the uniformity of their color as well as their dyeing fastness. In particular, we were interested in wash, rubbing, and light fastness. The obtained results for these three criteria of evaluation were very satisfactory: (1) color conformity (expressed in Colour Measurement Committee (2:1) and CIEDE2000 color differences) lower than the textile threshold of 1, (2) good evenness, and (3) color fastness not deteriorated in spite of the multiple reuses of dye baths. In this paper, the feasibility and efficiency of this technique was proved to considerably reduce water, dyes, and auxiliary quantities without disturbing the quality of the dyeing behavior.