Institute for Color Science and Technology (ICST) Progress in Color, Colorants and Coatings 2008-2134 19 4 2026 10 01 Simultaneous Dyeing and Functional Finishing of Linen Fabric with Cinnamon Bark Extract Using Chitosan as a Mordant 401 415 82165 10.30509/pccc.2026.167630.1435 EN Z. Ali Deptartment of Textile and Fibre Engineering, IIT Delhi, Hauz Khas, P.O. Box: 110016, New Delhi, India. P. Kumar Deptartment of Textile and Fibre Engineering, IIT Delhi, Hauz Khas, P.O. Box: 110016, New Delhi, India. N. Shaiwale Deptartment of Textile and Fibre Engineering, IIT Delhi, Hauz Khas, P.O. Box: 110016, New Delhi, India. J. Sheikh Deptartment of Textile and Fibre Engineering, IIT Delhi, Hauz Khas, P.O. Box: 110016, New Delhi, India. Journal Article 2025 08 19 The resurgence of environmentally friendly products, such as natural dyes, is inevitable in the textile industry. Significant advantages can be achieved through combined dyeing and multifunctional finishing with natural dyes. In this study, linen fabric was dyed with aqueous cinnamon bark extract (CBE), using chitosan as an eco-friendly mordant. Initially, linen fabric was treated with chitosan solution using the pad-dry-cure method, and this chitosan-mordanted fabric was dyed using the exhaust method at different levels % on the weight of fabric (% o.w.f.). After dyeing, colour and functional properties of the dyed linen, including colour strength, fastness properties, antibacterial activity, antioxidant activity, UV protection, and mosquito repellency, were evaluated. The dyed linen with superior properties in terms of wash fastness (4-5), mosquito repellency (>90 %), good UV protection (UPF up to 25), antibacterial activity against E. Coli (upto 92.5 %) and moderate antioxidant activity (upto 66 %) was obtained. Additionally, treated linen fabrics showed good light fastness (3-4). Cinnamon bark extract (CBE) containing cinnamaldehyde and other phenolic compounds was confirmed as a dye and finish for linen fabric. The interaction between cinnamon biomolecules and chitosan was confirmed using UV-Visible spectroscopy and other analytical techniques. The structure-property relationship of dyed linen responsible for colouration and functional properties, were discussed. https://pccc.icrc.ac.ir/article_82165_6014157de6d371104bfc49e776531440.pdf