730 JOURNAL OF COSMETIC SCIENCE (20) B. Xu and X. Chen, The role of mechanical stress on the formation of a curly pattern of human hair, J. Mech. Behav. Biomed. Mater., 4(2), 212–221 (2011). (21) G. E. Westgate, R. S. Ginger, and M. R. Green, The biology and genetics of curly hair, Exp. Dermatol., 26(6), 483–490 (2017). (22) K. Keis, K. R. Ramaprasad, and Y. K. Kamath, Studies of light scattering from ethnic hair fibers, J. Cosmet. Sci., 55(1), 49–63 (2004). (23) R. McMullen and J. Jachowicz, Optical properties of hair—detailed examination of specular reflection patterns in various hair types, J. Cosmet. Sci., 55(1), 29–47 (2004). (24) J. Menkart, L. Wolfram, and I. Mao, Caucasian hair, negro hair, and wool: similarities and differences, J. Soc. Cosmet. Chem., 17(13), 769–787 (1966). (25) C. Nappe and M. Kermici, Electrophoretic analysis of alkylated proteins of human hair from various ethnic groups, J. Soc. Cosmet. Chem., 40(2), 91–99 (1989). (26) H. A. Adeola, N. P. Khumalo, A. T. Arowolo, and N. Mehlala, No difference in the proteome of racially and geometrically classified scalp hair sample from a South African cohort: preliminary findings, J. Proteomics, 226, 103892 (2020). (27) K. Adhikari, T. Fontanil, S. Cal, J. Mendoza-Revilla, M. Fuentes-Guajardo, J.-C. Chacón-Duque, F. Al-Saadi, J. A. Johansson, M. Quinto-Sanchez, V. Acuña-Alonzo, C. Jaramillo, W. Arias, R. Barquera Lozano, G. Macín Pérez, J. Gómez-Valdés, H. Villamil-Ramírez, T. Hunemeier, V. Ramallo, C. Silva de Cerqueira, M. Hurtado, V. Villegas, V. Granja, C. Gallo, G. Poletti, L. Schuler-Faccini, F. M. Salzano, M.-C. Bortolini, S. Canizales-Quinteros, F. Rothhammer, G. Bedoya, R. Gonzalez-José, D. Headon, C. López-Otín, D. J. Tobin, D. Balding, and A. Ruiz-Linares, A genome-wide association scan in admixed Latin Americans identifies loci influencing facial and scalp hair features, Nat. Commun., 7, 10815 (2016). (28) J. D. dos Santos, H. G. M. Edwards, and L. F. C. de Oliveira, Raman spectroscopy and electronic microscopy structural studies of Caucasian and Afro human hair, Heliyon, 5(5), e01582 (2019). (29) J. H. Ji, T.-S. Park, H.-J. Lee, Y.-D. Kim, L.-Q. Pi, X.-H. Jin, and W.-S. Lee, The ethnic differences of the damage of hair and integral hair lipid after ultraviolet radiation, Ann. Dermatol., 25(1), 54–60 (2013). (30) Y. Kamath, S. Hornby, and H.-D. Weigmann, Effect of chemical and humectant treatments on the mechanical and fractographic behavior of Negroid hair. J. Soc. Cosmet. Chem., 36(1), 39–52 (1985). (31) T. Mamabolo, N. M. Agyei, and B. Summers, Cosmetic and amino acid analysis of the effects of lye and no-lye relaxer treatment on adult black female South African hair, J. Cosmet. Sci., 64(4), 287–296 (2013). (32) L. J. Wolfram, On straightening and relaxing of African hair, J. Cosmet. Sci., 66(3), 207–210 (2015). (33) L. Kreplak, F. Briki, Y. Duvault, J. Doucet, C. Merigoux, F. Leroy, J. L. Lévêque, L. Miller, G. L. Carr, G. P. Williams, and P. Dumas, Profiling lipids across Caucasian and Afro-American hair transverse cuts, using synchrotron infrared microspectrometry, Int. J. Cosmet. Sci., 23(6), 369–374 (2001). (34) R. L. McMullen, D. Laura, S. Chen, D. Koelmel, G. Zhang, and T. Gillece, Determination of physicochemical properties of delipidized hair, J. Cosmet. Sci., 64(5), 355–370 (2013). (35) Y. K. Kamath, Quantification of human hair moisturization with cosmetic products by dynamic vapor sorption, J. Cosmet. Sci., 71(5), 303–320 (2020). (36) F.-J. Wortmann, A. Hullmann, and C. Popescu, Water management of human hair, Int. J. Cosmet. Sci., 30(5), 388–389 (2008). (37) S. Chahal, N. Challoner, and R. Jones, Moisture regulation of hair by cosmetic proteins as demonstrated by dynamic vapour sorption—a novel efficacy testing technique, IFSCC Mag., 3(2), 19–25 (2000). (38) T. Evans, “Adsorption properties of hair,” in Practical Modern Hair Science. T. Evans and R. Wickett. Eds. (Allured Publishing, Carol Stream, IL, 2012), pp. 333–365. (39) C. Barba, M. Martí, J. Carilla, A. M. Manich, and L. Coderch, Moisture sorption/desorption of protein fibres, Thermochim. Acta, 552, 70–76 (2013). (40) A. Franbourg, P. Hallegot, F. Baltenneck, C. Toutain, and F. Leroy, Current research on ethnic hair, J. Am. Acad. Dermatol., 48(6 Suppl.), S115–S119 (2003). (41) M. Steggerda, Cross sections of human hair from four racial groups, J. Hered., 31(11), 474–476 (1940).

731 PHYSICOCHEMICAL PROPERTIES OF TEXTURED HAIR (42) M. Trotter, Anthropometry, Am. J. Phys. Anthropol., 24(1), 105–126 (1938). (43) K. Leerunyakul and P. Suchonwanit, Asian hair: a review of structures, properties, and distinctive disorders, Clin. Cosmet. Investig. Dermatol., 13, 309–318 (2020). (44) L. C. Lee, W. N. S. Wan Mohamad Fuad, S. S. Abdullah, and K. L. Ong, Preliminary study on morphometric analysis of the human scalp hair for discrimination of ethnic Malay and ethnic Chinese in Malaysia, Egypt J. Forensic Sci., 9(1), (2019). (45) Y. Kalmoni, F. K. Addai, S. K. Adjenti, K. K. Adutwum-Ofosu, J. Ahenkorah, B. A. Hottor, and R. M. Blay, Light microscopic morphology of indigenous Ghanaian African hair from scalp, eyebrow, axilla, and pubic regions, Int. J. Trichology, 11(1), 8–13 (2019). (46) G. Loussouarn, I. Lozano, S. Panhard, C. Collaudin, C. El Rawadi, and G. Genain, Diversity in human hair growth, diameter, colour and shape. An in vivo study on young adults from 24 different ethnic groups observed in the five continents, Eur. J. Dermatol., 26(2), 144–154 (2016). (47) G. Loussouarn, African hair growth parameters, Br. J. Dermatol., 145(2), 294–297 (2001). (48) D. Van Neste, Thickness, medullation and growth rate of female scalp hair are subject to significant variation according to pigmentation and scalp location during ageing, Eur. J. Dermatol., 14(1), 28–32 (2004). (49) P. E. Hutchinson and J. R. Thompson, The size and form of the medulla of human scalp hair is regulated by the hair cycle and cross-sectional size of the hair shaft, Br. J. Dermatol., 140(3), 438–445 (1999). (50) C. Robbins, Chemical and Physical Behavior of Human Hair (Springer, Heidelberg, Germany, 2012). (51) M. Feughelman, “Morphology and properties of hair,” in Hair and Hair Care, Cosmetic Science and Technology. D. Johnson. Ed. (Marcel Dekker, New York, NY, 1997), pp. 1–12. (52) J. Swift, “The structure and chemistry of human hair,” in Practical Modern Hair Science. T. Evans and R. Wickett. Eds. (Allured Publishing, Carol Stream, IL, 2012), pp. 1–37. (53) P. Prem, K. J. Dube, S. A. Madison, and J. Bartolone, New insights into the physicochemical effects of ammonia/peroxide bleaching of hair and Sepia melanins, J. Cosmet. Sci., 54(4), 395–409 (2003). (54) G. A. Camacho-Bragado, G. Balooch, F. Dixon-Parks, C. Porter, and H. Bryant, Understanding breakage in curly hair, Br. J. Dermatol., 173(Suppl. 2), 10–16 (2015). (55) N. P. Khumalo, R. P. Dawber, and D. J. Ferguson, Apparent fragility of African hair is unrelated to the cystine-rich protein distribution: a cytochemical electron microscopic study, Exp. Dermatol., 14(4), 311–314 (2005). (56) E. Cloete, N. P. Khumalo, and M. N. Ngoepe, Understanding curly hair mechanics: fiber strength, J. Invest. Dermatol., 140(1), 113–120 (2020). (57) M. G. A. Leite and P. M. B. G. Maia Campos, Mechanical characterization of curly hair: influence of the use of nonconventional hair straightening treatments, Skin Res. Technol., 23(4), 539–544 (2017). (58) Y. Yu, W. Yang, B. Wang, and M. A. Meyers, Structure and mechanical behavior of human hair, Mater. Sci. Eng. C Mater. Biol. Appl., 73, 152–163 (2017).