Effect of Aspartic Acid Intermediate Treatment on Bleached Hair by Hair Permanent Wave

Abstract

In general, it is hard to perm bleached hair. This study examined the effectiveness of permanent waves after dividing bleached hair into two groups: an experimental group (hair treated with 0.75% aspartic acid water), and a control group (hair treated with distilled water). In terms of wave retention when the hair was washed 30 times after receiving a perm, the experimental group was higher than the control group with 17.6% and 14.8% respectively. Retention was also affected by the number of times the hair was bleached. Hair bleached once exhibited better retention, 11.6% as compared to hair that had been bleach 3 times with 4.4%. In terms of tensile strength, the experimental group (6.04±0.16 kaf) was greater than the control group (5.31±0.14 kaf) by 13.75% (p<0.05) when the hair was bleached once. When bleached 3 times, the experimental group (4.60±0.16 kaf) was higher than the control group (4.27±0.22 kaf) by 7.73% (p<0.05). Regarding hair damage measured using the methylene blue method, the experimental group (0.208±0.016) was lower than the control group (0.262±0.020) by 20.61% in terms of absorption when bleached once (p<0.05). When bleached 3 times, the experimental group (0.375±0.028) was lower than the control group (0.473±0.038) by 20.72% (p<0.05). According to FE-SEM results, the experimental group was less than the control group in terms of cuticle damage when hair was bleached once as compared to hair that had been bleached 3 times. It could be used in the development of diverse hair care products.