Recent advancements in natural dye applications: a review

Antioxidants: Characterization, natural sources, extraction and analysis

With the public’s mature demand in recent times pressurized the textile industry for use of natural colorants, without any harmful effects on environment and aquatic ecosystem, and with more developed functionalities simultaneously. Advanced developments for the natural bio-resources and their sustainable use for multifunctional clothing are gaining pace now. Present review highlights historical overview of natural colorants, classification and predominantly processing of colorants from sources, application on textiles surfaces with the functionalities provided by them. Chemistry of natural colorants on textiles also discussed with relevance to adsorption isotherms and kinetic models for dyeing of textiles.

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Natural Colorants: Historical, Processing and Sustainable Prospects

Perspectives for natural product based agents derived from industrial plants in textile applications – a review

Biopolymers composites with peanut hull waste biomass and application for Crystal Violet adsorption.

Extraction of natural dye from red calico leaves: Gamma ray assisted improvements in colour strength and fastness properties

The decline in the use of artificial colourants due to their toxicity in food and textile industry, put forward by international market has increased the importance of natural raw materials. From those, pomegranate peel (Punica grantum) with solid applications is one of the most important sources of natural dyes. The major colouring component in pomegranate is tannins, extracted from the fresh and dried peels. The aim of present work is to evaluate pomegranate powder as natural textile dyestuff. The work consists of three steps, i.e. extraction, characterization and dyeing processes. The dye extraction procedure is conventional and traditional. Dyeing of different textiles, synthetic and natural fabrics with the extract of pomegranate powder has been carried out and dyeing has been optimized. Finally, dyed fabric have been subjected to different textile laboratory tests e.g., colour fastness, light fastness, washing fastness and rubbing fastness (dry and wet).

Dyeing of cotton fabric using pomegranate (Punica granatum) aqueous extract.

Appraisal of marigold flower based lutein as natural colourant for textile dyeing under the influence of gamma radiations

The revival of cultural heritage in a form of natural colorants for textile dyeing is gaining popularity due to their soothing nature and bright shades The present study was conducted to explore the coloring potential of harmala (Peganum harmala) seeds and to improve color strength of dye using microwave radiations followed by a mordanting process The results showed that harmala plant seeds could be an excellent source of natural dyes for cotton dyeing if the irradiated acidified methanolic extract (RE, 4 min) is used to dye un-irradiated fabric (NRC) at 85 °C for 45 min using a dye bath of pH 90 having salt concentration of 7 g/100 mL Alum (1%) as pre-mordants and iron (7%) as post-mordants have improved the color strength in chemical mordanting more than other mordants employed The bio-mordants employed reveal that 10% of acacia as pre-bio-mordants and 7% of acacia as post-bio-mordants are effective amounts to obtain high color strength Suggested ISO standards for colorfastness illustrate that bio-mordanting has given more excellent rating as compared to chemical mordants It is concluded that harmala seeds have a great potential to act as a source of natural colorant for cotton dyeing under the influence of microwave radiation

Shahid Adeel

Papers

Extraction of natural dye from red calico leaves: Gamma ray assisted improvements in colour strength and fastness properties

Dyeing of cotton fabric using pomegranate (Punica granatum) aqueous extract.

Appraisal of marigold flower based lutein as natural colourant for textile dyeing under the influence of gamma radiations

Microwave-assisted extraction and dyeing of chemical and bio-mordanted cotton fabric using harmal seeds as a source of natural dye

Modulation of pomegranate peel colourant characteristics for textile dyeing using high energy radiations