( ) () ( ) ( ) Yo ung'modulusasa s f t of treatment Mean Mean±SE Mean±SD Outliers Extremes Virgin 6% Bleac he d 9 Bleached Treatment 2E8 4E8 6E8 8E8 1E9 1.2E9 1.4E9 1.6E9 1.8E9 2E9 2.2E9 Dry state Young'smodulus as a function of treatment Mean Mean±SE Mean±SD Outliers Extremes Virgin 6% Bleached 9% Bleached Treatment 3E9 3.2E9 3.4E9 3.6E9 3.8E9 4E9 4.2E9 4.4E9 Dry state Young'modulus s (60% RH) as fn of treatment Mean Mean±SE Mean±SD Outliers Extremes Control 300 hr s UV Treatment 2.5E9 3E9 3.5E9 4E9 4.5E9 5E9 5.5E9 6E9 Dry state Young'smodulus for heat treated hair Mean Mean±SE Mean±SD Outliers Extremes Control 150 passes 300 passes Treatment 2.6E9 2.8E9 3E9 3.2E9 3.4E9 3.6E9 3.8E9 4E9 4.2E9 4.4E9 Figure 2. (A) Wet and (B) dry (60% RH) Young’s moduli of virgin and oxidative-treated and (C,D) dry moduli of (C) UV- and (D) heat-treated hair fibers. 674 JOURNAL OF COSMETIC SCIENCE suludom s'gnuoY )2mu/g( suludom s'gnuoY )2mu/g( suludom sgnuoY )2mu/g( suludom s'gnuoY )2mu/g(

() () 0 20 4 60 8 1 1e+9 2e+9 3e+9 4e+9 5e+9 Virginhair Young’smodulusasa f ti of RH 3x 9% bl h Relati humidit(%) Torsion Testing:Sh ea r Modulus (G Pa ) as Functi of Humidity % RH 20 40 60 80 100 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Virgin 3X Bleached Figure 3. Influence of RH on hair’s (A) extensional and (B) torsional moduli. 675 THE MATRIX REVISITED suludom s'gnuoY )aPG( suludoM raehS