Fastness Properties and Color Analysis of Natural Indigo Dye and Compatibility Study of Different Natural Reducing Agents

• Published in: Journal of polymers and the environment Vol. 25; no. 4; pp. 1219 - 1230
• Main Authors: Hossain, Md. Delwar, Khan, Md. Mashiur Rahman, Uddin, Md. Zulhash
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-12-2017; Springer Nature B.V
• Subjects: APPLES; BANANAS; BOILING; Chemistry; Chemistry and Materials Science; COLOR; Color fastness; CONCENTRATION RATIO; DATES; Dithionite; Dyes; Energy resources; Energy sources; Environmental Chemistry; Environmental Engineering/Biotechnology; Environmental impact; EXTRACTION; INDIGO; Industrial Chemistry/Chemical Engineering; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; Materials Science; Natural resources; Original Paper; pH effects; PH VALUE; POLLUTION; Polymer Sciences; REDUCING AGENTS; REDUCTION; Sodium; SODIUM COMPOUNDS; Sodium dithionite; TEXTILES; Natural reducing agent; Color fastness; Indigo dye; Dye ability
• ISSN: 1566-2543; 1572-8919; 1572-8900
• DOI: 10.1007/s10924-016-0900-6

Conventional reduction process of indigo dyes with sodium dithionite produced lots of harmful byproducts and caused environmental pollution. A new reduction method should be introduced to textile dyer so that reduction can be less hazardous with low impact on the environment and energy resources. This study investigates an alternative reducing agent obtained from natural resources. Three different types of reducing agent are used, extracted from the Date palm, Banana and Apple by boiling method. To compare their effect on the reduction of the natural indigo dyestuff, different color fastness properties, pH and the color yield (K/S) were measured according to the concentration of reducing agent and hydrated lime concentration. Outcomes show that K/S value varies with the amount of reducing agent. Average higher value shows from date palm among the three reducing agents at 25 °C & pH range 10.8–11. By using natural reducing agents, it can be possible to get satisfactory colorfastness and depth of shed compared to a synthetic reducing agent.