JOURNAL OF COSMETIC SCIENCE 116 Figure 1. Luster of medium brown hair, (a) bleached and (b) virgin, treated with shine controls. In this fi gure luster is calculated using the Reich-Robbins formula as implemented in the Samba system.

2008 TRI/PRINCETON CONFERENCE 117 DISCUSSION This work is organized around two goals, the development of control treatments for shine measurements on hair and the validation of these measurements as perceptually relevant. LUSTER CONTROLS Measurements of luster using polarized imaging can be accomplished with a repeatability of approximately 10% (variance/mean). Based on actual variances, we have estimated the Figure 2. Shine vs color damage standards. Formulas: (a) Reich-Robbins. (b) TRI. (c) Stamm. (d) Bossa- Nova Technologies. Figure 3. Skew vs color.

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