13 citations
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February 2008 This study reports that the newly developed natural dye-based sindoor is safe for skin application and offers a non-toxic alternative to synthetic dye-based sindoor.
3 citations
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April 2023 in “Research Journal of Pharmacy and Technology” This study suggests that a hair dye formulated with nano-sized Calendula Officinalis extract can effectively color white hair and lighten black hair, offering an alternative to synthetic dyes.
This study examined the use of plant extracts as natural hair dye colourants, highlighting their antioxidant properties and eco-friendly benefits. The authors reported that plant-based dyes effectively deliver vibrant colours and enhance hair health while offering a sustainable alternative to synthetic dyes.
This study found that extracts from plants like onion peel and walnut possess strong antioxidant properties, making them promising eco-friendly alternatives to synthetic hair dyes, delivering vibrant colors and better wash fastness when combined with oxalic acid.
May 2026 in “Zenodo (CERN European Organization for Nuclear Research)” This review highlights that natural hair dyes from plant-derived pigments can produce viable colors on gray hair with low irritation potential, though they face challenges in shade range and consistency; some products may also be adulterated, affecting safety perceptions.