نبذة مختصرة : Objective: The objective of this study is to investigate the potential of using crajiru leaves as a natural dye for cotton fabrics. Theoretical Framework: This section presents the main concepts and theories underpinning the research. Key theories include natural dyeing, the chemistry of natural dyes, dye extraction methods, and the theory of adsorption on textile substrates, providing a solid foundation for understanding the research context. Method: The methodology adopted for this research comprises an experimental study, including dye extraction, fabric dyeing, and the evaluation of fastness and UV protection. The materials used include dried crajiru leaves, chitosan, acetic acid, non-ionic detergent, temperature control equipment, and dyeing machines. Data collection was carried out through direct observations of the extraction and dyeing processes, as well as laboratory tests to measure extraction efficiency, dye yield, wash fastness, and UV protection. Results and Discussion: The results revealed that higher temperatures led to greater efficiency in extracting the dye from crajiru leaves. The fabric dyeing process showed that higher temperatures resulted in better dye yield. Pre-treatment of the fabrics with chitosan significantly increased the absorption of the dye by cotton fibers, improving dye yield. Wash fastness tests indicated that the dyed fabrics maintained good fastness properties. The UV protection assessment showed that the crajiru extract promoted high UV protection, especially in samples pre-treated with chitosan. In the discussion section, these results are contextualized in light of the theoretical framework, highlighting the implications and identified relationships. Possible discrepancies and limitations of the study are also considered in this section. Research Implications: The practical and theoretical implications of this research are discussed, providing insights into how the results can be applied or influence practices in the field of sustainable textile technology. These ...
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