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How Does Chemical Lightening Affect the Structure of Human Hair?

CSEF · 2019 Materials Science (Junior Division Only)

Elysiah N. Nguyen · Portola (Gaspar de) Highly Gifted Magnet Middle School, Tarzana, Los Angeles County

Overview

Objectives This study examines the damages of chemical lightening on the structure of human hair by testing hair's elasticity. Methods Human hair, styrofoam boards, pins, chemical lightening solution (3% hydrogen peroxide). Hair was lightened for different periods of time and used the hair to make hygrometers. Measured the length of the hair from the hygrometers after being placed in a humid area. Results After placing the hygrometers in a humid area, the length of the chemically lightened hair from the hygrometer increased. The hair that was lightened for the longest period of time increased its length the most. Conclusions The longer the time of chemical lightening on hair, the more the growth of the hair. This means that the hydrogen peroxide solution caused more damage on the structure of human hair because there was more growth taking place for the lightened hair.

Summary statement

I showed the damage of chemical lightening on the structure of human hair through its elasticity.

Help received

None. I did all the parts of my project/experiment by myself.

Competition history

  • CSEF 2019 Materials Science (Junior Division Only) · Entry J1317

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