CHLORINATION OF HAIR AND pH 377 pH I0 -- - -" CONTROL CYCLES 30 CYCLES pH 7 CQNTROL --------- ---- ,- - -- - -- , 5 CYCLES 30 CYCLES pH2 • ' - CONTROL 5 CYCLES 30 CYCLES Figure 1. Examples of Instron © force patterns illustrating the effect of pH and cycles of chlorination. Figure 4b shows little further change in the fiber surfaces with additional cycles of chlorination, a result supported by the frictional data presented earlier. These changes in surface structure are similar to those seen in the chlorination of wool (13-17).

378 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Figure 2a. Blond hair, pH 7 control. Figure 2b. Blond hair, 15 cycles of chlorination at pH 10.

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