1. Bulter HP. Poucher’s Perfumes, Cosmetics & Soaps. 10th ed. Berlin: Springer; 2000.
2. Yang FC, Zhang Y, Rheinstadter MC. Structure of human hair. PeerJ. 2014;2:e619. http://doi.org/10.7717/peerj.619
3. Rosen MR. Harry’s cosmetology. 9th ed. New York: Chem. Publ. Co.; 2015.
4. Matamá T, Costa C, Fernandes B, Cavaco Paulo A. Changing human hair fibre colour and shape. J Appl Res Eng. 2023;21:100–113. http://doi.org/10.1016/j.jare.2023. 11.013
5. Lakhanova KM, Kedelbaev B, Yeleugaliyeva N, Korazbekova K. Study of melanin distribution in Karakul lamb hair cells. Small Rumin Res. 2022;215:106693. http://doi.org/10.1016/j.smallrumres.2022.106693
6. Barrera Ochoa CA, Pepe F. Fundamentals of Hair & Follicles. Plast Reconstr Surg Fundam. 2024;20:345–356. http://doi.org/10.1007/978-3-031-61894-9_20
7. aughn M. Blonde hair colour classification & genetics for forensic use. Forensic Sci Rev. 2010;22(1):45–60. http://doi.org/10.25958/15540
8. Shimomura Y, Christiano AM. Biology & genetics of hair. Annu Rev Genom Hum Genet. 2010;11:109–132. http://doi.org/10.1146/annurev-genom-021610-131501.
9. Robbins R. Chemical and Physical Behavior of Human Hair. 5th ed. Berlin: Springer; 2021. http://doi.org/10.1007/978-3-642-25611-0
10. Popat RR, Zanke AA. Review of natural resources as hair colour & dye. World J Pharm Pharm Sci. 2020;9(5):270–277. http://doi.org/10.20959/wjpps20205-16016
11. Thomas KE, Cruz PR. Hair science under microscopy: morphology & damage. Int J Trichol. 2022;13(1):44–51. http://doi.org/10.3390/app11167333
12. Johnson J, Wendel D. Keratin fibre composition & degradation mechanisms. Biochim Biophys Acta. 2019;1867(9):118675. http://doi.org/10.1021/acssuschemeng.9b01527
13. Howard T, Singh G, Malik D. Melanin biochemistry in human hair. Pigment Cell Res. 2016;29(4):300–318. http://doi.org/10.1111/php.13744
14. Morel OJX, Christie RM. Current trends in permanent hair dye chemistry. Chem Rev. 2011;111:2537–2561. http://doi. org/10.1021/cr1000145
15. Peters P, Gao J. Oxidative mechanisms of coloration. J Cosmet Dermatol. 2018;17(2):115–126. http://doi.org/10. 1111/jocd.12484
16. Almeida L, Vicente C, Pereira R. Safety assessment of modern hair colorants. Regul Toxicol Pharmacol. 2021;124:104970. http://doi.org/10.1021/acs.chemrestox.1c00427
17. Barros R, Cardoso M. The kinetics of hair oxidation by H2O2. Color Technol. 2019;135:54–61. http://doi.org/10. 1096/fj.08-125435
18. Gago Duport L, Díaz L. Chemistry of para phenylenediamine reaction pathways. Dyes Pigments. 2017;142:270–280. http://doi.org/10.1186/s12302-015-004 4-7
19. Lewendowski S, Hofmann R. Bond disruption & reformation during bleaching. J Phys Chem B. 2021;125(8):1824–1836. http://doi.org/10.1021/acs.jpcb.0 c11461
20. D’Souza E, Nayak R. Sustainable natural dye alternatives. Green Chem. 2023;25:4870–4884. http://doi.org/10.3390/ molecules28165954
21. Reinhold M, Silva E. Assessment of dye penetration in cortex layers. Int J Cosmet Sci. 2020;42(5):480–492. http://doi.org/10.1111/ics.12683
22. Kaiser J, Kunz T. J Cosmet Sci. 2015;66:205–213.
23. Yamamoto K, Tanaka Y, Sato H. J Soc Cosmet Chem Jpn. 2022;56(2):97–108.
24. Bolton A, Weller T. Cosmet Toiletries. 2020;135(4):225–232.
25. da França SS, Dario M, Esteves VB, Baby AR. Cosmetics. 2015;2:110–126. http://doi.org/10.3390/cosmetics2020110.
26. Harrison S, Sinclair R. J Cosmet Dermatol. 2004;2:180–185. http://doi.org/10.1111/j.1473-2130.2004.00064.x
27. Patil L, Kendre V, Sekhar S. J Hazard Mater. 2017;324:92–101.
28. Hedberg Y, Uter W, Banerjee P. Contact Dermatitis. 2018;79(5):308–315. http://doi.org/10.1111/cod.13074
29. Oberlander S, Young R. Polym Degrad Stab. 2019;166:292–301.
30. Uchelen M, Laa O. J Soc Cosmet Chem. 2018;69(2):143–153.
31. Kim D, Seo H. Korean J Chem Eng. 2016;33(9):2820–2826.
32. Baumgarten K. Phytochem Rev. 2023. http://doi.org/ 10.1007/s11101-023-09839-9.
33. Fong K, Patel D. J Trichol Cosmetol. 2024;13(1):41–56.
34. Rogers M, Desmond N. J Environ Chem Eng. 2019;7(3):103183.
35. Tan A, Shimizu T. Int J Cosmet Sci. 2021;43:98–107.
36. Arslan E. Dyes Pigments. 2021;184:108924. http://doi.org/ 10.1515/psr-2020-0146
37. Rao P. Recent Adv Phytochem. 2022;58:55–78. http://doi.org/10.1007/s12010-022-04050-z.
38. Johns R. Micron. 2018;110:45–52.
39. Wu JY, Li Q. J Anal Appl Pyrolysis. 2021;155:105081.
40. Chen Z, Li B, Zhu L. Photochem Photobiol. 2020;96:1290–1299.
41. Gao F, Chan PY. Appl Opt. 2019;58(31):8803–8812. http://doi.org/10.1117/1.JBO.17.3.036010.
42. Huang R. Adv Funct Mater. 2022;32(48):2206756.
43. Kumar R, Singh V, George R. Proteomics. 2020;20:e2000071.
44. Lim T, Yoo J. J Raman Spectrosc. 2017;48:1520–1528. http://doi.org/10.1111/ics.12808
45. Peysson A, Bonnet MJ. Spectrochim Acta A Mol Biomol Spectrosc. 2021;258:119891.
46. Towns A. Color Technol. 2021;137:301–335. http://doi. org/10.1111/cote.12545
47. Sun Y, Wang C, Sun M, Fan Z. RSC Adv. 2021;11:1694–1699. http://doi.org/10.1039/D0RA09539G
48. Choi N, Lee H. J Nanomater. 2023;2023:5498120. http://doi.org/10.3390/molecules28020645.
49. Roth E, Banerjee T. Int J Cosmet Sci. 2024;46(2):190–202.
50. Krishnan S, Patel P. Int J Environ Res Public Health. 2019;16(19):3608. http://doi.org/10.3390/ijerph16193608
51. Nelson R. Nanomaterials. 2020;10(11):2148. http://doi.org/ 10.3390/nano10112148
52. Wu H, Zhang C. Colloids Surf B Biointerfaces. 2021;198:111449. http://doi.org/10.1016/j.colsurfb.2022. 112676.
53. Eskandari A, Rahim S. Int J Mol Sci. 2022;23(16):9157. http://doi.org/10.3390/ijms23169157.
54. Smith L. Cosmetics. 2023;10:74. http://doi.org/10.3390/ cosmetics10030074.
55. Lin H. Environ Sci Pollut Res. 2018;25(14):13289–13297. http://doi.org/10.1007/s11356-022-24398-3.
56. Chen L. Chemosphere. 2021;283:131228. http://doi.org/ 10.3390/toxics11110911
57. Tanda Y, Sato K. J Cosmet Sci. 2023;74(1):40–53.
58. Burke J, Sharma L. Regul Toxicol Pharmacol. 2019;104:130–140. http://doi.org/10.3390/cosmetics5030 047.
59. Ito Y, Maeda T. J Theor Comput Chem. 2022;21(3):2150006.
60. Qureshi A, Nair S. Comput Cosmet Model. 2023. http://doi.org/10.1016/j.cocom.2023.07.005.
61. Christie RM. Colour Chemistry. 2nd ed. London: R Soc Chem; 2015. http://doi.org/10.1039/9781782626510
62. Martin Q, Ettlinger J. Cosmet Toiletries. 2017;132(9):82–95.
63. Yu L, Zhao J. Int J Cosmet Sci. 2021;43(4):392–400.
64. Sharma S, Anand P. Photoprotection mechanisms in hair fiber structure. Photodermatol. Photoimmunol. Photomed. 2020;36(5):355–362.
65. Basu M, Kundu A. DFT analysis of melanin synthetic pathways. J Phys Chem A. 2018;122(9):2420‑30. Available from: http://doi.org/10.1021/jp123456
66. Jusuf NK, Subramaniam Y. Relation between hair colouring & scalp problems. Int Arch Med. 2016;9. Available from: http://doi.org/10.3823/1940
67. Hegde P, Nair M. Epidemiological survey of allergic responses to hair dyes. Indian J Dermatol Venereol Leprol. 2023;89(2):210‑7.
68. Garcia T. Consumer risk perception in hair cosmetics. J Consum Behav. 2020;19(5):411‑23.
69. Petrova A, Fedorov I. Hairdressing salons toxicity control. Occup Health Saf. 2018;87(4):34‑41.
70. Kim J, Lee B. Innovations in color retain shampoos. J Cosmet Sci. 2019;70(5):263‑73.
71. Wong T, Chiu S. Corrosion influence of metal containers for dyes. Mater Chem Phys. 2021;262:124296.
72. Matsuo K, Hara M. Long term oxidation stability of dyes. J Soc Cosmet Chem Jpn. 2018;54(3):167‑75.
73. Yu N, Li G. Formulation optimization using response surface methodology. Cosmetics. 2019;6(3):54.
74. Hu Y, Wei Z, Wu X. Thermus thermophilus extract for hair growth & scalp health. J Cosmet Dermatol. 2025;24(3). Available from: http://doi.org/10.1111/jocd.70095
75. Tanaka M, Jin S. Nutritional components supporting hair color maintenance. Nutrients. 2020;12(8):2384.
76. Wang S, Zhang K. Molecular replacement effects of hair care additives. J Mol Struct. 2023;1276:134808.
77. Quintana F, Lopez G. Natural pigment aging profiles. Molecules. 2019;24(19):3452.
78. Itoh Y, Fujikawa T. Comparative natural vs synthetic pigment complexity. J Cosmet Sci. 2021;72(2):150‑61.
79. Sanz MA, Robledo D. Resilience of hair colour under UV. J Photochem Photobiol B. 2018;182:274‑83.
80. Pacheco C, Mendez J. Recovery kinetics post dye removal. J Cosmet Dermatol. 2020;19(4):789‑98.
81. Bui T, Phan V. Overview of dye process regulation global scale. Regul Toxicol Pharmacol. 2020;117:104722.
82. Cortes L, da Silva P. Environmental fate of PPD derivatives. Sci Total Environ. 2021;779:146488.
83. Yamada N, Kato T. Emerging eco friendly solvents in cosmetics. Curr Opin Green Sustain Chem. 2022;35:100634.
84. Chen K, Li H. Eco design strategies for sustainable hair dye. Green Chem. 2023;25:2788‑97.
85. Kutlu Ö, Wollina U. Management of Hair Loss. In: Textbook Cosmet Dermatol. 6th ed. CRC Press; 2024. Available from: http://doi.org/10.1201/b22897
86. Rai S. Ethical aspects of cosmetic testing. J Appl Ethics. 2020;12(3):142‑59.
87. Tolle L, Drake P. Education in hair color chemistry. J Cosmet Educ. 2021;6(2):61‑72.
88. Kobayashi K, Hirota Y. Standardization of safety for dye ingredients. Int J Cosmet Sci. 2022;44(6):577‑85.
89. Tahan T, Luo J. Hair fibre hydration & mechanical stability. ACS Appl Polym Mater. 2023;5(9):8431‑42.
90. Finkel A. Encyclopaedia of Cosmetic Science. Oxford: Elsevier; 2020.
91. Perez F, DaCosta J. Temporal durability of semi permanent colour effects. J Cosmet Sci. 2019;70(3):144‑55.
92. Salazar D, Lima A. Effect of nanoparticle conditioners on dyed hair. Colloid Polym Sci. 2022;300(11):1291‑302.
93. Harrington L. Review: pigment stability metrics across brands. Cosmetics. 2022;9:96.
94. Park S, Jang T. Quantitative hair damage assessment with AI imaging. Pattern Recognit Lett. 2023;171:53‑61.
95. Arnold C. Visual comparison models for consumer preference prediction. J Cosmet Market. 2025. Available from: http://doi.org/10.1016/j.jcm.2025.04.002
96. Reyes J. Toxic pollutants arising from personal care industries. Environ Pollut. 2022;299:118906.
97. Deng Y, Cho B. Quantitative measurement of non oxidative colour loss. Anal Chim Acta. 2021;1168:338622.
98. Sahin Y, Aydin A. Microbial interaction with hair care residues. Microb Biotechnol. 2023;16(3):712‑25.
99. Liu Y, Tao D. Overview of cosmetic colorant standards. J Cosmet Sci. 2017;68(1):53‑66.
100. Irizarry Y. The Irizarry Hair Texture Scale. April 2025. Estrada S, Montalvan‑Burbano N, Cabrera MR. Innovation and Entrepreneurship: A Colour Economy Glance. SHS Web Conf. 2025;211:01001.
101. Estrada S, Montalvan‑Burbano N, Cabrera MR. Innovation and Entrepreneurship: A Colour Economy Glance. SHS Web Conf. 2025;211:01001.
102. Dhananjay KV, Gosavi GP, Venkat MS, Tukaram NV. A review on formulation and evaluation of herbal hair serum. Int J Adv Res Sci Commun Technol. March 2025. http://doi.org/10.48175/IJARSCT23928
103. Hernandez Vera U. Lack of influence of the scalar hair on the DC conductivity. Phys Rev D. April 2025;111(8). http://doi.org/10.1103/PhysRevD.111.084035
104. The 8 Best Professional Hair Color Brands, According to Hair Experts. 2025. Available from: https://www.byrdie.com/best-professional-hair-color-lines-348331
105. Hair Color Market Analysis — Europe, North America, APAC, South America, Middle East and Africa: US, Germany, China, UK, Canada, Brazil, France, India, Italy, Japan — Size and Forecast 2025‑2029. 2025. Available from: https://www.technavio.com/report/hair-color-market-industry-analysis.