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Natural Dyeing of Modified Cotton Fabric with Cochineal Dye

Department of Textile Chemistry and Ecology, University of Zagreb Faculty of Textile Technology, HR-10000 Zagreb, Croatia
Author to whom correspondence should be addressed.
Academic Editor: Baljinder Kandola
Molecules 2022, 27(3), 1100;
Received: 28 December 2021 / Revised: 3 February 2022 / Accepted: 5 February 2022 / Published: 7 February 2022
(This article belongs to the Special Issue Advances in Textile Materials Chemistry)
Natural dyes are not harmful to the environment owing to their biodegradability. For dye application to textiles, salts are necessary as mordant or electrolytes and make an environmental impact. In this paper, the influence of cationization during mercerization to the dyeing of cotton fabric with natural dye from Dactylopius coccus was researched. For this purpose, bleached cotton fabric as well as fabric cationized with Rewin OS was pre-mordanted using iron(II) sulfate heptahydrate (FeSO4·7H2O) and dyed with natural cochineal dye with and without electrolyte addition. For the characterization of surface changes after cationization, an electrokinetic analysis on SurPASS was performed and compared to pre-mordanting. For determination of dye exhaustion, the analysis of dye solution was performed on a UV/VIS spectrophotometer Cary 50 Solascreen. Spectrophotometric analysis was performed using a Datacolor 850 spectrophotometer, measuring remission ”until tolerance” and the whiteness degree, color parameters, color depth (K/S), and colorfastness of dyed fabric were calculated. Levelness was determined by visual assessment. Cationized cotton fabrics showed better absorption and colorfastness. Pre-mordanting and cationization showed synergism. The electrolytes improved the process of dye absorption. However, when natural dyeing was performed on cotton fabric cationized during mercerization, similar chromacity, uniform color, and colorfastness were achieved with and without electrolyte, resulting in pure purple hue of cochineal. For achieving a violet hue, pre-mordanting with Fe-salt was needed. Therefore, salt can be reduced or even unnecessary, which makes this process of natural dyeing more environmentally friendly. View Full-Text
Keywords: cotton fabric; cationization during mercerization; pre-mordanting; dyeing; natural cochineal dye cotton fabric; cationization during mercerization; pre-mordanting; dyeing; natural cochineal dye
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MDPI and ACS Style

Čorak, I.; Brlek, I.; Sutlović, A.; Tarbuk, A. Natural Dyeing of Modified Cotton Fabric with Cochineal Dye. Molecules 2022, 27, 1100.

AMA Style

Čorak I, Brlek I, Sutlović A, Tarbuk A. Natural Dyeing of Modified Cotton Fabric with Cochineal Dye. Molecules. 2022; 27(3):1100.

Chicago/Turabian Style

Čorak, Ivana, Iva Brlek, Ana Sutlović, and Anita Tarbuk. 2022. "Natural Dyeing of Modified Cotton Fabric with Cochineal Dye" Molecules 27, no. 3: 1100.

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