Dyeing of Wool with Anthraquinone based Natural Colorants from Cassia fistula fruit

ABSTRACT

The searches for new sources of natural dyes have been recently increased in many countries. This article is aimed to explore the dyeing potential of Cassia fistula as a source of natural dye on wool. In this study, the anthraquinone colorants are extracted from fruit of Cassia fistula by aqueous extraction method. Mordanting and subsequent dyeing of wool with extracted colorants were then performed to study the colorimetric and fastness properties. Three metallic salts aluminum sulfate, ferrous sulfate, stannous chloride and their combinations were used in this study to fix and increase the color as well as fastness properties of the substrate. UV visible and Fourier transform infrared spectroscopy (FTIR) analysis show identification of functional groups in the dye molecule. Colorimetric properties were analyzed by reflectance spectrometry in terms of L*, a*, b*, c*, h^○ and K/S values. Color fastness was investigated in terms of light, wash and rub (dry/wet) tests. Results demonstrate that novel and fashionable brown shades with different hue and tone were obtained. Therefore, Cassia fistula has an exciting opportunity to be used as a source of natural dye in textile coloration.

摘要

许多国家最近增加了对天然染料新来源的研究。本文旨在探讨Cassia fistula作为天然染料在羊毛上的染色潜力。本研究采用水提法从决明子中提取蒽醌类色素。媒染和提取染料羊毛染色进行研究和比色牢度性能。本研究采用三种金属盐硫酸铝、硫酸亚铁、氯化亚锡及其配合物来固定和提高基材的色牢度。紫外可见和红外光谱分析表明染料分子中的官能团。比色特性的反射光谱法分析*, a*, b*, c*, h^○和K/S值。颜色的耐光性，水洗和摩擦（干/湿）试验进行了调查。结果表明，色调新颖、时尚的色调深浅不同。因此，Cassia fistula有一个令人兴奋的机会，可以作为纺织品染色中天然染料的来源。

KEYWORDS:

• Color
• Dyeing
• Fastness
• Mordant
• Shades
• Textile

关键词:

• 莫登特
• 颜色
• 纺织
• 色牢度
• 染色
• 色调

Additional information

Funding

The authors are thankful to University Grant Commission (UGC), New Delhi for providing financial support through Research Fellowship to Central University Ph.D. Students.