Showing papers in "Journal of Cosmetic Science in 1971"

Elasticity and tensile properties of human hair. II. Light radiation effects.

Abstract: Synopsis--The effects on the TENSILE PROPERTIES of HAIR by LIGHT RADIATION in the form of ULTRAVIOLET and SUNLIGHT are reported. These effects are interpreted from the stress-strain measurements made on single fiber tests and the indcx used is the force at 15% elongation. The ultraviolet light effects were studied by exposing hair samples to a carbon-arc lamp for increasing pcriods of time, while the solar effects were examined by exposing hair to natural daylight for periods of ten wceks. The daylight exposures were made throughout the year to study seasonal variation in the solar radiation. Effects of other environmental factors such as temperature and humidity were monitored by