Fig. 7

DSC measurement curves showing the moisture binding energy inside hair. a DSC spectra measured to determine hair moisture behavior patterns (n = 6). The dashed line in the DSC spectrum is the area reference line for the enthalpy calculations. b Enthalpy due to the endothermic reaction of moisture when hair is heated. The lines above the bar graph denote a significant difference (n = 6) calculated via Student’s t test. *P < 0.05.