Ultraviolet-Protective Textiles: Exploring the Potential of Cotton Knits Dyed with Natural Dyes
Year: 2025
Type: article
Abstract: Ultraviolet radiation (UVR) represents significant risks to both textile durability and human health. Natural dyes are gaining attention as eco-friendly alternatives to synthetic UV-blocking agents, offering aesthetic and functional benefits. This study explores the UV-protective properties of 100% cotton knit fabrics dyed with natural dyes—indigo, weld, and madder—using different mordanting processes, including materials with mordant abilities such as alum, pomegranate peel, and tannin extracted from quebracho. Twenty samples were evaluated, including undyed, individually treated, and combined dye-mordant formulations. UV protection was assessed through spectral transmittance and Ultraviolet Protection Factor (UPF) measurements before and after washing. The results showed that natural dyes significantly improved the UV resistance of cotton fabrics, particularly when combined with products like pomegranate and the tannin–alum mixture. Notably, some samples demonstrated improved UPF and became darker after washing, such as mordant combinations like tannin with alum. These findings suggest that natural dye, when combined with appropriate mordants, offers a sustainable and effective approach to producing UV-protective textiles. This is particularly valuable in children’s clothing, where chemical safety and sun protection are crucial. Future research should investigate the influence of pH on dye stability and UV-blocking performance to optimise formulations for industrial use and long-term functionality.
Source: Textiles
Authors: Diana Santiago, Joana Cunha, Paulo Mendes, Isabel Cabral
Language: English
Subfield: Building and Construction
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,207
Awards: Design de moda sustentável e funcional – uma abordagem por via dos corantes naturais, G1998940930, Dynamic color: interactive and sustainable textile design through pigmentary and structural coloration, Centro de Ciência e Tecnologia Têxtil, Centro de Ciência e Tecnologia Têxtil, G479293769, G6997658380, G8657037615
OpenAlex ID: W4413182007