Efficacy/Claims Substantiation

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Hair as a Test Substrate

Nov 12, 2014Trefor A. Evans, PhD; TA Evans LLC, Princeton, NJ USA

Hair is a distinctly variable material, and the nature of this substrate can have a major impact on laboratory test results. This article discusses hair as a laboratory substrate to provide guidance on minimizing variability and creating optimal test conditions.

Quantifying the Performance of Hair Styling Products—Part 2

Aug 21, 2014Trefor Evans, PhD, TA Evans LLC

A previous article discussed traditional measurements to assess the properties of hair spray products. However, the properties of polymer films deposited by these products are not constant and can be altered by both formulation means and environmental conditions. This article highlights additional useful measurement techniques for characterizing these film properties.

Quantifying the Performance of Hair Styling Products—Part 1

May 20, 2014Trefor A. Evans, PhD, TA Evans LLC, Princeton, NJ

There are two general classifications of hair styling products—those that help with style creation and those that prolong the style. Both facilitating style creation and promoting hold longevity stem from the presence of water-soluble polymers in formulations. This paper discusses methods to evaluate these properties and quantify performance.

Correlating Aging with Skin’s Mechanical and Optical Properties

May 1, 2014Olga Freis, PhD, Gilles Perie and Andreas Rathjens, BASF Beauty Creations/Care Solutions, Pulnoy and Essey-lès-Nancy, France

The aim of this study was to monitor the evolution of biomechanical and optical properties of the skin with aging. Different biophysical parameters were measured, including skin: elasticity and firmness, color, brightness, fluorescence emission, sebum content, hydration and pH. A significant evolution of the evaluated parameters with aging was observed.