336 JOURNAL OF COSMETIC SCIENCE (a) (b) (c) -. (d) Figure 1. Topography (a), error signal (b), LFM [left-to-right] (c), LFM [right-to-left] (d) for untreated hair. Images were obtained simultaneously for a 20 pm a s• us• area.

2000 ANNUAL SCIENTIFIC SEMINAR 337 8000 7000 6000 5000 4000 3000 2000 1000 X virgin hair [] n-hexane/t-butanol & chloroform/methanol Y = 464.17x + 2153 6 A bleached = . + 2059.5 X X X•.•.•=.•.• X y= 92.565x + 1715.7 2 4 6 8 10 12 Set Point (nN) Figure 2. Frictional signal (calculated as difference between LFM left-to-right and LFM right- to-left) as a function of normal force for different types of hair.

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