56 JOURNAL OF COSMETIC SCIENCE +1 +1 +1 +1 ....
OXIDATIVE HAIR DYES 57 500 e 300 -- 5 8 2 • 150 -- -30 I I I 0 7.5 15.0 22.5 30.0 Retention time (min) 500 4 • 300 - E --- 2 o 150 - 3 -30 I I I 0 7.5 15.0 22.5 30.0 Retention time (min) 500 4 z• 5 • 300 -- -3O I I I 0 7.5 15.0 22.5 30.0 Retention time (rain) Figure 4. Chromatographic separations of three shampoos spiked with four hair dye intermediates, after matrix extraction. a: shampoo 1. b: shampoo 2. c: shampoo 3. Peaks: (1)p-phenylenediamine (amphoteric form), (2)p-phenylenediamine (basic form), (3) m-phenylenediamine sulfate, (4) m-aminophenol, and (5) resorcinol.
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