Asian Journal of Environment & Ecology

Natural dyes, derived from botanical, animal, and microbial sources, are attracting renewed commercial and scientific attention, driven by mounting evidence of the ecological and toxicological consequences of synthetic dye production and discharge. This review critically examines the value chain architecture and market potential of natural dyes across their principal industrial applications, encompassing textiles, food and beverages, cosmetics, and emerging specialty sectors. The biological diversity of natural dye sources is surveyed with attention to chemically distinct classes of colouring compounds and their distribution across plant, insect, and microbial taxa. Established and advanced extraction technologies — including ultrasound-assisted, microwave-assisted, and supercritical fluid extraction — are evaluated in relation to their efficiency, scalability, and environmental profile. The structure of natural dye value chains is analysed from primary agricultural production through processing intermediaries to end-use markets, with particular attention to governance dynamics and the distribution of economic returns among chain participants. Global and regional market trends are assessed with reference to demand drivers in the food, textile, and cosmetics sectors, alongside the regulatory frameworks that increasingly govern natural colorant use in major markets. The environmental and social dimensions of natural dye production receive critical evaluation, including trade-offs between biodegradability benefits and agronomic costs, and the implications of value chain structure for rural livelihoods and gender equity. Biotechnological innovations — notably metabolic engineering for microbial dye production, microalgal cultivation, and biorefinery integration — are examined as pathways to improving cost competitiveness and scalability. Key barriers to market expansion, including colourfastness limitations, supply inconsistency, and regulatory fragmentation, are identified alongside practical recommendations for their resolution. The review concludes that natural dyes represent a strategically significant and commercially viable component of the emerging bio-based economy, though the full realisation of their market potential requires coordinated technological, institutional, and governance advances.