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Related Experiment Videos

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
PubMed
Summary
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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.

Related Experiment Videos

  • 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.