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SHAMPOO ANALYSIS 321 (a) 20 15- E v 5- z o • -15-",,- -20- -25 0 1'0 2'0 30 40 5• 6b 7b 80 TIME ( min ) (b) 4.50- 4.00- • 3.50- •n 3.00- v 2.50- t 2.00- •o 1.50- 1.00- 0.50- 0.01 (C) 30 25- •_ 15- 0 • 10- z 0 (,.) 0 0 Shampoo A ß 10% Shampoo A ] 1'0 2b 3b 4b 5b 6'0 7'0 TIME ( min ) [] 1%ShampooA ß 10%ShampooA ] 8O ß 0,1199 l/rain ß 0.1556 l/rain ß 0.0937 l/rain 0.1035 1/rnin 1'0 20 30 4'0 50 6'0 7'0 TIME ( min ) 8O D 1%ShampooA ß 10%ShampooA ] Figure 4. Zeta potential (a), flow rate (b), and conductivity (c) as a function of time for hair treated with 1.0% and 10% w/w solutions of Shampoo A.