Title
Color and physical properties of cotton fabrics dyed with natural pigment extracted from Peristrophe roxburghiana leaf
Authors
TUAN ANH NGUYEN, TRAM ANH DOAN HONG and TU CHINH PHAM

Received February 7, 2026
Published Volume 60 Issue 3-4 March-April
Keywords natural dyes, Peristrophe roxburghiana (PR), natural dyes, cotton dyeing, cleaner production, color fastness, eco-friendly mordant

Abstract
This study investigates the dyeing performance of cotton fabrics using natural pigment extracted from Peristrophe roxburghiana (PR) leaves as a sustainable alternative to synthetic dyes. The research aims to optimize dyeing parameters, while assessing both color performance and environmental benefits within a cleaner production framework. Pigment extraction was conducted using an aqueous, low-chemical process, and dyeing was performed under varying conditions of temperature, time, pH, and mordant concentration. Color strength and fastness were evaluated using reflectance spectrophotometry and standard testing. The optimal dyeing conditions (60 °C, 60 min, mildly acidic pH) resulted in enhanced color strength (K/S). Among the mordants tested, CuSO4·5H2O at 0.5% showed the most significant improvement in K/S values and wash fastness. Importantly, the process demonstrated reduced chemical usage and maintained acceptable fabric properties, including air permeability, wrinkle recovery, and flexural rigidity. These findings highlight PR pigment as a promising bio-based colorant for cotton textiles, supporting cleaner production strategies and environmentally responsible textile manufacturing.