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<p> Synthetic dyes have largely replaced natural colorants because those dyes provide many coloration options and are easy to apply. However, in Bangladesh, jute fiber is known as the “golden fiber”. It is commonly dyed with basic dyes that cause environmental pollution. This research aims to provide an eco-sustainable coloration method by using natural dye extracted from red amaranth (<i>Amaranthus tricolor</i>). The leaves were boiled at different temperatures, pH levels, extraction time, and concentrations. UV-Vis results at 540 nm showed that the best extraction occurred at 250 g/L leaf concentration, 30 minutes, 60°C, and neutral pH (7), which produced the highest absorbance. Jute fabrics were dyed using the exhaust method after pre-mordanting with alum, ferrous sulfate, copper sulfate, stannous chloride, potassium dichromate, and tannic acid. The effects of dye bath temperature, pH, dyeing time, and mordant type were examined. The best dyeing results were achieved at 100°C, 80 minutes, and pH 3.3. Ferrous sulfate, tannic acid, and stannous chloride produced the brightest and most intense shades. Chromaticity (C*) and color strength (K/S) measurements showed that dyeing conditions strongly affected dye uptake % and color quality. These findings confirm that red amaranth is a promising natural alternative to synthetic dyes for jute.</p>

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Eco-Friendly Dyeing of Jute Fabric Using Red Amaranth (Amaranthus tricolor) Extracts: Insights for Cottage Industries in Bangladesh

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Md. Abdullah Al Mamun,
  • Md. Tareque Rahaman,
  • Julekha Akter,
  • Tanjina Akter Happy,
  • Alimran Hossain

摘要

Synthetic dyes have largely replaced natural colorants because those dyes provide many coloration options and are easy to apply. However, in Bangladesh, jute fiber is known as the “golden fiber”. It is commonly dyed with basic dyes that cause environmental pollution. This research aims to provide an eco-sustainable coloration method by using natural dye extracted from red amaranth (Amaranthus tricolor). The leaves were boiled at different temperatures, pH levels, extraction time, and concentrations. UV-Vis results at 540 nm showed that the best extraction occurred at 250 g/L leaf concentration, 30 minutes, 60°C, and neutral pH (7), which produced the highest absorbance. Jute fabrics were dyed using the exhaust method after pre-mordanting with alum, ferrous sulfate, copper sulfate, stannous chloride, potassium dichromate, and tannic acid. The effects of dye bath temperature, pH, dyeing time, and mordant type were examined. The best dyeing results were achieved at 100°C, 80 minutes, and pH 3.3. Ferrous sulfate, tannic acid, and stannous chloride produced the brightest and most intense shades. Chromaticity (C*) and color strength (K/S) measurements showed that dyeing conditions strongly affected dye uptake % and color quality. These findings confirm that red amaranth is a promising natural alternative to synthetic dyes for jute.