Indigo Powder
Features and Benefits
Indigo, derived from the leaves of Indigofera tinctoria, has been used for centuries as a natural and safe alternative to chemical hair dyes, giving rich blue to deep black shades (Klaas, Vill and Straske, 2025)
Known for its plant-powered goodness, indigo is packed with compounds like indican, indigotin, indirubin and isatin that enhance colour while helping protect the scalp from damage (Klaas, Vill and Straske, 2025)
It is widely trusted in natural hair care for its safety, offering effective colouring results without the use of harsh chemicals (Lueadnakrob et al., 2025)
In its powdered form, indigo appears green to dark green with a mild herbal scent and it can be stored for up to 24 months when kept in a cool, dry place (Klaas, Vill and Straske, 2025)
Indigo is not just a natural dye. It can also be used as a hair care treatment to condition the scalp, strengthen hair roots, reduce dandruff, and promote healthy hair (Mishra, Gomare and Sheelwant, 2020)
Indigo’s key compound, indican, transforms into a rich blue pigment through oxidation, giving hair its signature colour (Syafaatullah and Mahfud, 2021)
At the same time, indirubin can add a subtle reddish tone, while flavonoids and tannins provide antioxidant and scalp-balancing benefits (Syafaatullah and Mahfud, 2021)
As the colour develops, indigo creates a deep, natural-looking shade, often enhanced by combining it with henna for richer brown to black tones (Adeel et al., 2020)
Beyond colouring, indigo helps nourish the hair, reduce hair fall, and may even delay early greying (Times of India, 2021)
While generally safe, excessive use may cause dryness or mild allergic reactions (Times of India, 2024)
Table of contents
INCI Name: Indigofera Tinctoria Leaf Powder
Botanical Name: Indigofera tinctoria L.
Molecular Formula: C16H10N2O2
CAS No. 84775-63-3 (Refers to Indigofera tinctoria extract/leaf powder)
EINECS No. 283-892-6
Common Names: Neel Powder, Indigo Leaf Powder, Natural Indigo
Appearance: Greenish to dark blue powder
Active Colouring Component: The primary colorant within the leaves is Indigotin (CAS No. 482-89-3).
Function (INCI): Skin conditioning, hair colouring
Description:
Indigo, Indigofera tinctoria L., is a natural dye derived from the leaves of the Indigofera plant, widely recognized for its use as a hair colorant. Its primary benefits for hair include providing deep blue and black shades, enhancing hair coloration naturally and offering a safer alternative to synthetic dyes.
From the research by Klaas, Vill and Straske (2025) it was observed that Indigo contains a group of components like Indican, Indirubin, and Isatin, which contribute to its colouring properties and functional performance. These components not only facilitate effective hair pigmentation but also possess antioxidant properties that can promote scalp health and reduce oxidative damage.
Additionally, indigo-based dye mixtures have been evaluated by Lueadnakrob et al., (2025) for their safety and efficacy, demonstrating their potential to deliver intense hair coloration while maintaining safety standards. Therefore, Indigo powder is a potential and natural colouring agent that is mostly used in the cosmetics industry as an alternative to synthetic hair colourants.
Structural formula of some chemical constituents in Indigo (Source: Qi-Yue et al., 2020)
Specifications:
Parameter |
Specifications |
Common Name |
True Indigo |
Plant Part Used |
Leaves |
Appearance |
Fine green to dark green powder |
Odor |
Mild, characteristic herbal odor |
Mesh Size |
80–100 mesh (or as required) |
Moisture Content |
≤ 10% |
pH (1% aqueous solution) |
6.0 – 7.5 |
Total Ash |
≤ 15% |
Acid Insoluble Ash |
≤ 5% |
Foreign Matter |
≤ 2% |
Heavy Metals |
Within permissible cosmetic limits |
Microbial Load |
As per cosmetic regulatory standards |
Shelf Life |
24 months under proper storage |
Storage Conditions |
Store in a cool, dry place away from sunlight |
Application |
Natural hair dye and herbal hair formulations |
Table 1: Specifications of Indigo Powder (Source: Klaas, Vill and Straske, 2025)
Functions of Indigo Powder
Parameters |
Functions |
Natural Hair Dye |
Safe alternative to chemical dyes; gives a deep blue-black tone and rich brown-black shades when used with henna — no ammonia or peroxide. |
Scalp Care |
Antimicrobial properties help reduce dandruff, itchiness, and scalp infections. |
Stronger Hair |
Nourishes roots, supports density, and helps reduce hair fall. |
Natural Conditioning |
Smooths cuticles, reduces frizz, and adds shine. |
Prevents Premature Greying |
Regular use may help darken and manage early greys. |
Table 2: Functions of Indigo Powder (Source: Mishra, Gomare and Sheelwant, 2020)
Compositions:
Component Category |
Constituent / Compound |
Chemical Nature / Formula |
Function / Significance |
Dye Precursor |
Indican (Indoxyl-β-D-glucoside) |
Glycoside |
Main precursor that forms indigo pigment |
Dye Intermediate |
Indoxyl |
Organic compound |
Oxidizes to produce indigo dye |
Natural Pigment |
Indigo |
C₁₆H₁₀N₂O₂ |
Blue colouring compound |
Natural Pigment Isomer |
Indirubin |
Isomer of indigo |
Adds depth to the colour, reddish hue |
Flavonoids |
Kaempferol derivatives |
Polyphenolic compound |
Antioxidant activity |
Flavonoids |
Quercetin derivatives |
Polyphenolic compound |
Anti-inflammatory, antioxidant |
Tannins |
Natural tannins |
Polyphenols |
Astringent, mordanting properties |
Saponins |
Natural saponins |
Glycosides |
Mild cleansing properties |
Alkaloids |
Trace alkaloids |
Nitrogen-containing compounds |
Mild bioactive effects |
Proteins |
Plant proteins & amino acids |
Organic macromolecules |
Hair strengthening support |
Carbohydrates |
Natural polysaccharides |
Plant carbohydrates |
Structural plant component |
Minerals (Trace) |
Calcium, Iron, Magnesium |
Inorganic elements |
Nutritional support |
Moisture Content |
Residual moisture (5–10%) |
Water content |
Stability parameter |
Table 3: Components of Indigo Powder (Source: Syafaatullah and Mahfud, 2021)
Major Pigmenting Components of Indigo Powder
- Indican (Indoxyl-β-D-glucoside): This is the key colourless, water-soluble precursor found in the leaves (typically 0.2–0.8% in fresh leaves, but the powder concentrates these compounds).
Type |
|
Solubility |
|
Occurrence |
|
Role |
|
Table 4: About Indican (Source: Adeel et al., 2020)
- Indigo (Indigotin): The main, water-insoluble blue pigment formed after fermentation and oxidation of indican.
Chemical Formula |
C₁₆H₁₀N₂O₂ |
Type |
Bis-indole compound |
Solubility |
Water-insoluble |
Colour |
Deep blue |
Table 5: About Indigotin (Source: Poulin, 2007)
- Indirubin: A red isomer of indigo, which is a major, and sometimes dominant, constituent in some formulations
Isomer of indigo |
|
Colour Profile |
|
Table 6: About Indirubin (Source: Chen et al., 2012)
Our Product with Indigo Powder:
Geeky Research Findings
Benefits of Indigo Powder for Hair:
Natural Hair Dye: Indigo powder is widely used as a natural alternative to chemical dyes. It imparts a rich, deep blue or black colour to the hair without damaging the scalp or hair strands (Times of India, 2021).
Conditions Hair and Scalp: Indigo powder has conditioning properties that help smoothen hair cuticles, making hair softer, shinier, and more manageable (Qi-Yue et al., 2020).
Promotes Hair Growth: Regular use of Indigo powder can strengthen hair roots and stimulate hair growth, reducing hair fall and promoting thicker hair (Qi-Yue et al., 2020).
Prevents Dandruff: Its antimicrobial and antifungal properties help combat dandruff and scalp infections, keeping the scalp healthy.
Reduces Hair Damage: Being a natural product, indigo powder minimizes the risk of dryness, brittleness, or damage that often accompanies chemical dyes (Times of India, 2021).
Eco-Friendly and Chemical-Free: Indigo powder is organic, biodegradable, and free from harmful chemicals like ammonia, peroxide, or PPD, making it safer for long-term use (Qi-Yue et al., 2020).
Darkens Hair Naturally: It effectively darkens hair over time, especially when combined with henna, resulting in a natural black or brown shade (Times of India, 2021).
Common Side Effects of Indigo Powder
Allergic reactions: Excessive or improper application of Indigo Powder can trigger different allergic reactions like itching, redness or swelling on the scale (Times of India, 2024).
Dryness: Although, limited evidence has been found but as per some sources Indigo can sometimes make hair dry or brittle (Lueadnakrob et al., 2025).
Unintended hair colour results: Indigo powder may give a greenish tint if not applied properly or mixed with other hair dyes like henna.
Preventing the Side Effects of Indigo Powder
Perform a Patch Test: Always test on a small patch of skin (such as behind the ear) 48 hours before full application to check for any allergic reactions or sensitivity.
Add Moisture: Mix indigo powder with hydrating agents like oils or curd to help prevent excessive scalp dryness and keep your hair moisturized.
Use Proper Technique: Combine indigo with henna if you want a deep brown or black shade, rather than applying it alone, to achieve better colour results and reduce the risk of uneven or undesirable colour.
FAQ:
What are the benefits of using indigo powder for hair?
Indigo powder can naturally darken hair, cover gray hair, and improve scalp health. It is also a chemical-free alternative to synthetic dyes, providing a deep, natural color and helping strengthen hair over time.
How do I perform a patch test before using indigo powder?
Apply a small amount of the mixed indigo paste on a patch of skin, such as behind the ear or on the inner elbow. Leave it for 48 hours to check for any allergic reactions or irritation before applying to your scalp and hair.
Can indigo powder be used on all hair types?
Yes, indigo powder is generally safe for all hair types. However, results may vary depending on the natural hair colour and condition. It’s recommended to do a patch test and follow proper application techniques for best results.
How long should I leave indigo powder on my hair?
Typically, indigo powder should be left on the hair for 1 to 2 hours. For darker shades, some prefer to leave it longer. Always monitor your hair and scalp for any discomfort during the process.
Is it necessary to mix indigo with other ingredients?
While indigo can be used alone, mixing it with henna or hydrating agents like curd or oils can enhance colour results, improve hair moisture, and reduce dryness or irritation.
How often can I use indigo powder for hair colouring?
Indigo can be used once every 4 to 6 weeks, depending on your hair’s condition and desired colour intensity. Frequent use may lead to dryness, so it’s important to keep hair moisturized and follow proper aftercare.
References:
- Adeel, S., Amin, N., Ahmad, T., Batool, F. and Hassan, A., 2020. Sustainable isolation of natural dyes from plant wastes for textiles. Recycling from waste in fashion and textiles: a sustainable and circular economic approach, pp.363-390. https://www.researchgate.net/profile/Fatima-Batool/publication/343026041_Sustainable_Isolation_of_Natural_Dyes_from_Plant_Wastes_for_Textiles/links/5f17c329a6fdcc9626a686f0/Sustainable-Isolation-of-Natural-Dyes-from-Plant-Wastes-for-Textiles.pdf
- Chen, Z.Q., Liu, Y., Zhao, J.H., Wang, L. and Feng, N.P., 2012. Improved oral bioavailability of poorly water-soluble indirubin by a supersaturatable self-microemulsifying drug delivery system. International journal of nanomedicine, pp.1115-1125. https://www.tandfonline.com/doi/pdf/10.2147/IJN.S28761
- Klaas, S., Vill, V. and Straske, F., 2025. Indirubin as a red hair Colourant from Indigofera tinctoria L. International Journal of Cosmetic Science, 47(5), pp.877-886. https://onlinelibrary.wiley.com/doi/pdf/10.1111/ics.13076
- Lueadnakrob, K., Juntrapirom, S., Rongthong, T., Kanjanakawinkul, W. and Chaiyana, W., 2025. Functional Performance and Safety Evaluation of Optimized Plant-Based Dye Mixtures for Intense Hair Coloration. Cosmetics, 12(2), p.78. https://www.mdpi.com/2079-9284/12/2/78
- Mishra, D.N., Gomare, K.S. and Sheelwant, S.V., 2020. GC-MS Analysis and phytochemical screening of Indigofera tinctoria (Linn.) leaf extract characterizing its medicinal use. International Journal of Ayurvedic Medicine, 11(2), pp.289-299. https://www.researchgate.net/profile/Komal-Gomare/publication/342751121_1540-Indigofera_tinctoria/links/5f04b7464585155050921457/1540-Indigofera-tinctoria.pdf
- Poulin, J., 2007. Identification of indigo and its degradation products on a silk textile fragment using gas chromatography-mass spectrometry. Journal of the Canadian Association for Conservation, 32, pp.48-56. https://d1wqtxts1xzle7.cloudfront.net/28412130/vol32_doc4-libre.pdf?1390874159=&response-content-disposition=inline%3B+filename%3DIdentification_of_Indigo_and_its_Degrada.pdf&Expires=1771419479&Signature=ccaTLXv4V4YpPrfKEhRYNJoTtNDAfMWepZLOanwmAfY0oR20JVsQNfcyStwfkl8oXVMN8cWQ5CVeMtFofn7-NoO7rkogAJ3K6BOZFg1dcohTdJKkGc5M6q0vBehDk2woSY1SGffiBxRfRVMubB729v1M8fd8qC1Makbz1fSDTOwpuRW4OkPCZ5Fd~7f82FWuWdJsxbEU-G87oyC61xBQ~xm8TfzUg4PtrnHpMp7q~U~aok8ekwbkpAKlUFyEUhlquiZz7Od2lABS7xQo9P6wXCzuMBqtY5RBXOd3fbKtfF-7iYjKUeCVrX076lmtk7CCw9JbcrPdlnGSSGQ1BBm1DQ__&Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA
- Qi-Yue, Y., Ting, Z., Ya-Nan, H., Sheng-Jie, H., Xuan, D., Li, H. and Chun-Guang, X., 2020. From natural dye to herbal medicine: a systematic review of chemical constituents, pharmacological effects and clinical applications of indigo naturalis. Chinese Medicine, 15(1), p.127. https://link.springer.com/content/pdf/10.1186/s13020-020-00406-x.pdf
- Syafaatullah, A.Q. and Mahfud, M., 2021, February. Optimization extraction of Indigofera tinctoria L. using microwave-assisted extraction. In IOP Conference Series: Materials Science and Engineering (Vol. 1053, No. 1, p. 012131). IOP Publishing. https://iopscience.iop.org/article/10.1088/1757-899X/1053/1/012131/pdf
- Times of India., 2021. Indigo: Indigo powder hair benefits: Powerful benefits of Indigo Powder for Hair Health: - Times of India, The Times of India. Available at: https://timesofindia.indiatimes.com/life-style/beauty/hair-care-powerful-benefits-of-indigo-for-hair-health/articleshow/88300053.cms
- Times of India., 2024. Does your hair dye have indigo in it; here are the side effects, The Times of India. Available at: https://timesofindia.indiatimes.com/life-style/beauty/does-your-hair-dye-hair-indigo-in-it-here-are-the-side-effects/articleshow/112382797.cms#:~:text=Improper%20application%20can%20result%20in,Health%20+
- Wahyuningsih, S., Ramelan, A.H., Wardani, D.K., Aini, F.N., Sari, P.L., Tamtama, B.P.N. and Kristiawan, Y.R., 2017, April. Indigo dye derived from Indigofera tinctoria as natural food colorant. In IOP Conference Series: Materials Science and Engineering (Vol. 193, No. 1, p. 012048). IOP Publishing. https://iopscience.iop.org/article/10.1088/1757-899X/193/1/012048/pdf
