Institute for Color Science and Technology (ICST) Progress in Color, Colorants and Coatings 2008-2134 19 4 2026 10 01 Statistical Analysis of Levelness Parameter of CTAC Modified Cotton Knit Dyed with Fluorescent Pigment in Pad Batch Method 389 400 82160 10.30509/pccc.2025.167634.1434 EN Mst. T. Aktek Department of Wet Process Engineering, Bangladesh University of Textiles (BUTEX), Tejgaon, Dahka-1208, Bangladesh U. Khair Fatema Department of Environmental Science & Engineering, Bangladesh University of Textiles (BUTEX), Tejgaon, Dahka-1208, Bangladesh Md. Z. Uddin Department of Wet Process Engineering, Bangladesh University of Textiles (BUTEX), Tejgaon, Dahka-1208, Bangladesh Journal Article 2025 08 17 Dispersion stability and application method of fluorescent pigment have a great influence on the level dyeing of cotton fabric. Focusing on this, cotton knit fabric is cationized with Cetyl Trimethyl Ammonium Chloride (CTAC), and then dyed with fluorescent pigment in the pad batch method. Here, cationization was performed so that fluorescent pigment can be entrapped on it, which reduces their migration, thus providing dispersion stability to provide level dyeing. The effect of varying pretreatment conditions was investigated, and optimum conditions for cationization and pigmentation were established in terms of statistical parameters of K/S value, like standard deviation (S), relative standard deviation (Sr), levelness (L), and unlevelness (U) parameters to obtain an accurate numerical value of levelness of cellulose fabric dyed with fluorescent pigment. The results display at pH 9 and 54 g/L CTAC concentration, providing higher CTAC adsorption. Besides, FTIR spectrophotometry analysis of scoured, bleached, and CTAC adsorbed fabric is carried out to reveal adsorption chemistry. Furthermore, for characterization of samples, color fastness to water, wash, perspiration (acidic and alkaline), and rubbing (wet and dry) are performed. Although tensile strength has increased, a slight reduction in bursting strength and softness of the dyed fabric is observed. However, the main novelty of this research is the utilization of the cationizer named CTAC that is padded before fluorescent pigment applications. The outcomes of the statistical analysis of the levelness parameter also suggest that the greater efficacy of CTAC for level dyeing of fluorescent pigmented fabric can be used in fashion as well as functional purposes. https://pccc.icrc.ac.ir/article_82160_30cd04f07f67af18a7f417adcd28389c.pdf