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Hair photoprotection by dyes
C M Pande1, L Albrecht, B Yang
1Clairol Inc., 2 Blachley Road, Stamford, CT 06922, USA.
Journal of Cosmetic Science
|January 5, 2002
Summary
Hair dyes offer sun protection for hair. While permanent dyes initially weaken hair, they slow degradation from photodamage, acting as a sun shield against UV rays.
Area of Science:
- Cosmetic Science
- Materials Science
Background:
- Hair fibers are susceptible to photodamage from UV exposure.
- Hair dyes are widely used for aesthetic purposes.
Purpose of the Study:
- To investigate the photoprotective effects of hair dyes.
- To quantify the impact of hair dyes on hair's resistance to sun damage.
Main Methods:
- Assessing hair fiber tensile strength.
- Monitoring the integrity of disulfide bonds in hair fibers.
- Comparing photodegradation rates between dyed and undyed hair.
Main Results:
- Dyed hair exhibits a reduced rate of degradation upon photoirradiation compared to undyed hair.
- Permanent hair dyes initially cause oxidative damage but provide long-term photoprotection.
- Hair dye efficacy in photoprotection was measured through tensile strength and disulfide bond integrity.
Conclusions:
- Hair coloring provides a beneficial, though often overlooked, protective effect against photodamage.
- Hair dyes can mitigate the detrimental effects of UV exposure on hair structure.
- The photoprotective properties of hair dyes warrant further consideration in cosmetic applications.