Natural Colorants: Historical, Processing and Sustainable Prospects

Abstract

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.Graphical Abstract

Bio-based additives for thermoplastics

“…Because of this, bio-based colorants like indigoids, carotenoids, quininoids, among others, mostly find application in the field of textile fibers, which are less thermally stressed during their processing. We will not discuss this matter further as the focus of this review is thermoplastics, but we refer the reader to a comprehensive review on this subject [18] .…”

Aplicação De Condimentos Na Revelação De Impressões Digitais Latentes: Um Experimento No Ensino De Química

“…4,5 Os corantes naturais são muito utilizados em alimentos, como indicadores de pH, em cosméticos e na produção de tintas. [6][7][8] Alguns condimentos também apresentam substâncias corantes em sua composição, como é o caso do condimento cúrcuma obtido da espécie Curcuma longa L. que tem como principal corante a curcumina. 9 A cúrcuma é principalmente utilizada como condimento, entretanto possui outras aplicações na área de cosméticos, têxtil e alimentícia.…”

Simultaneous Removal of Dyes Colour and Cu(II) Metal Ions using Acetone-Formaldehyde-Salicyclic Acid Resin

“…In the field of colours, the dyes are visible pollutants and presence of very minute concentration of colouring substances in water makes it unsuitable for domestic purpose due to its undesirable appearance. Most industries employ dyes and pigments to impart colour to their products [1,2]. Around 10,000 different natural and synthetic dyes are being manufactured and their consumers are mainly textile, paper-pulp industries, metals, alloys and plastics, and are responsible for unsafe environment [1].…”