Chemical And Physical Treatments Damage Caucasian And Afro-Ethnic Hair Fibre: Analytical And Image Assays

July 2019 in “ JEADV. Journal of the European Academy of Dermatology and Venereology/Journal of the European Academy of Dermatology and Venereology ”

Leila David Bloch, Alessandra Mari Goshiyama, Michelli Ferrera Dario, Cassiano Carlos Escudeiro, Fernanda Daud Sarruf, Maria Valéria Robles Velasco, Neusa Yuriko Sakai Valente

bleaching dyeing UVA radiation Vis radiation cuticle wear protein loss tryptophan content ammonium thioglycolate eumelanin hair straightening hair dye hair bleach UV radiation

TLDR Chemical and physical treatments like bleaching, dyeing, and UV radiation damage both Caucasian and Afro-ethnic hair.

The study evaluated the effects of various chemical and physical treatments on different types of hair, including Caucasian and Afro-ethnic hair. It found that bleaching/dyeing and UVA/Vis radiation significantly damaged Afro-ethnic hair by increasing combing work and causing cuticle wear, protein loss, and reduced tryptophan content. Straightening with ammonium thioglycolate led to notable color fading in brown/black hair, while UVA/Vis radiation primarily affected blond hair due to its low eumelanin content. The research highlighted the importance of understanding hair shape-related damage to develop safer cosmetic products for maintaining the beauty of curly hair.

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