SHAMPOO ANALYSIS 323 (a) 20 15- 10- I-- z t.U 0- I- o -lO- -15- -2o (b) 4.5 [] [] [] 0 • 1'0 115 2'0 2'5 3'0 315 4'0 415 5'0 515 610 615 70 TIME (MIN) 3.5- 1.5- 0.5 0 ,• 1'0 1'5 2'0 2'5 3'0 3'5 4'0 4•5 5'0 5'5 6'0 6'5 70 TIME (MIN) (C) 2O- 17,5- 15- 12.5 10- 7.5 5- 2.5- [] [] [] 0.1623 [l/rain] 0.1741 [l/rain] 0 S 110 15 20 25 3'0 3'5 4'0 4'5 5'0 5'5 6'0 6'5 70 TIME (MIN) Figure 5. Zeta potential (a), flow rate (b), and conductivity (c) as a function of time for hair treated with 5% solution of Shampoo B.

324 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (a) 20- 15- 10- 5- 0- -20 0 1'0 20 3b 4b 5'0 6b 7'0 80 TIME ( min ) [] ShampooC + Shampoo D • Shampoo E - ShampooF (b) 4.5o 4 00- 3 50- o') 3,00- -.... v 250- • 2 O0 + O• 1,50- LL 1.00- 0.50- .,...:..,,--.....' .,....,,-,--....- ,+. 3 01 um OlU: • 1 20 urn 3,38 urn 5.02 urn o.OCo lb 2b 30 4b 5'0 •'0 io so TIME (min) [] ShampooC + Shampoo D • Shampoo E - Shampoo F (c) 30- 25- 20- lO- 0 10 2•) 3•) 4'0 5'0 6'0 7b 80 TIME ( rain ) [] ShampooC + Shampoo D • Shampoo E - Shampoo F Figure 6. Zeta potential (a), flow rate (b), and conductivity (c) as a function of time for hair treated with 1% solutions of Shampoos C, D, E, and F.