C Vayssié

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A new test developed to characterize the bending properties of treated or virgin hair fibers is described. The device consists of a pendulum that bends a sample made up of 39 parallel hair fibers at each swinging stroke. Hair bending stiffness can be assessed by the number of strokes observed until the pendulum stops. The mechanical behavior of natural hair(More)
Synopsis Apart from the problem of colour, the cosmetic properties of hair after dyeing play a vital role both for the cosmetic chemist and the user. A methodology for a quantitative assessment of these conditioning effects is proposed. This methodology is based on a realistic approach to the protocols, and uses original apparatus and accessories which take(More)
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