SHAMPOO ANALYSIS 331 (a) 20 15- •' 10- • 5- z W 0- 0 n -5- N -10- -15- • '"-• %• -200 • 1'0 1'5 2'0 2'5 3'0 3'5 4•0 4'5 5'0 5'5 6'0 6'5 7'0 7•5 8'0 8'5 90 TIME (MIN) Shampoo d + Shampoo K (b) 5- 4.5- •- 2.5- • 2- o, 1.5• u_ 1 0.5 ø0 5 1'0 1•5 2'0 2'5 3'0 3'5 4'0 4'5 5'0 5'5 6'0 6'5 7'0 7'5 8'0 8'5 90 TIME (DIN) Shampoo d + Shampoo K J (C) 20 17.5- •' 15- (,- E •i 4' 0'191/E•.•in•3••1/?in0.19•+E:• v 12.5- 10 5- 2.5- 0.17 l/rain 0.17 l/rain 0.18 l/finn 0.1, 00 5 10 15 20 25 30 35 4'0 4'5 5'0 5'5 6'0 6'5 7'0 75 80 85 90 TIME (DIN) I • Shampood + ShampooK ] Figure tO. Zeta potential (a), flow rate (b), and conductivity (c) as a function of time for hair treated with 5.0% solutions of Shampoos J and K.

332 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (a) 2o 15- LU -1O- N -20 0 (b) 4.50 4.00- • 3.50- •'• • 3.00- ..... v 2.50- • 2.00- •o 1,50 " 1 .oo- 0.50 0.00 0 110 2'0 3'0 4'0 5'0 6'0 7'0 TIME ( min ) [] Shampoo L + Shampoo M 4- 0.59 ,urn 0.59 ,urn 10 20 30 40 50 TIME ( min ) 80 60 70 80 [] ShampooL + ShampooM ] (C) 30- 25- 15 10- 5- • o o 1'o 2'0 3'0 4'0 5'o 6'0 7'0 80 TIME ( min ) I • ShampooL + ShampooM 1 Figure 11. Zeta potential (a), flow rate (b), and conductivity (c) as a function of time for hair treated with 1.0% solutions of Shampoos L and M.