since it receives lesser UV radiation intensity.
Such a swelling behavior was also seen in the initial stages of irradiation in cotton fiber [43]. The primary process of UV induced chain scission may also lead to a similar increase in the free volume hole size, but that does not appear to be a plausible explanation here because of two reasons. Firstly, the photoreaction products are hydrophilic and hence tend to associate with other polar protein fragments in hair soon after
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