34 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Dandruff Itching ß ß ß WO SO i I I I I i 0 3 4 5 6 7 Day Figure 4a. Effect ooe no shampooing for six successive days on dandruff suppressed by ZPT, as expressed by clinical grade and itching. 6.0 5.0 P*•O.001 i 7 Day Figure 4b. Effect of no shampooing for six successive days on dandruff suppressed by ZPT, as expressed by corneocyte count.

ANTIMICROBIAL EFFECT OF ZPT 35 I 0 6 •1 05 I 0 4 3 P• 0.01 P• 0.01 • O oo 0 P•O.01 o o o P•0•5 o Aerobe 0 Anaerobe ß Yeast 3 4 $ 6 7 Day Figure 5. Effect of no subsequent shampooing for six successive days on microbial count, following treatments with 1.0% ZPT-containing shampoo for 3 weeks.

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