Hair coloring and bleaching can permanently break down hair protein and temporarily change its properties.
October 2024 in “UNESP Institutional Repository (São Paulo State University)” This study investigated the effects of ammonium thioglycolate and amino methylpropanol hair straightening followed by permanent coloring, finding significant physical and chemical changes to both the cuticle and cortex of hair fibers.
May 2026 in “International Journal of Cosmetic Science” This study found that repeated exposure to ozonated water caused oxidative changes in hair proteins, lipids, and pigments, leading to altered hair properties, with minimal effects on shine and color.
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December 2018 in “Journal of Analytical Toxicology” This study found that exposure to artificial sunlight led to variable changes in ethyl glucuronide levels in hair, with both increases and decreases observed depending on hair characteristics.
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January 2011 This study found that the primary mechanism behind hair relaxation in Afro-hair is the alkali-induced denaturation of helical filaments, leading to spontaneous straightening.