Background :
@EN The effects of external chemicals on the hair shat are of great interest in both the medical field and the cosmetic industry. Current methods to analyze these effects consist mainly of macroscopic testing such as touch and tell little about
the
morphologic changes of hair shaft, especially cuticle, after application of permanent dye.
@ES Object :
@EN The coloring was performed as routine procedures. The time of contact of the dyeing solyution within the scalp and hair was 30minutes. The coloring process ends with a through rinsing with water. Scanning electron microscopic findings of hair
cuticle was observed sequentially before and after application of hair dye.
@ES Results :
@EN After 30minutes, cuticular swelling without degeneration was seen. As the swelling improve, the cuticular degradation was noted initially at 90minutes. By the 2 hours to the 1 week gradual progression of cuticular degradation was noted. By
1week
after coloring, cortical exposure due to extensive cuticvular detachment was observed. The reaction reached a peak between 1 and 2 weeks. Then, damaged cuticles were gradually regenerated and returned to pre-treatment states by 8weeks.
@ES Conclusion :
@EN The hair fibers take 1 month to grow out by 1cm, at wehich point a fresh dye application becomes necessary. However, although the cuticles were regenerating, the cuticular damage still remained after 6 weeks. So, we concluded that interval of
coloring is required more than 8weeks. But further study to protect cuticle and to improve regeneration will be needed for shortening of regeneration time. (Kor J Dermatol 1996;34(1) : 257~263)
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