300 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS 9 e•--e----'•e-- • -'P H 10.3 [ 6 . •,_ - a•PH 6.5 • 5 o o PH 3.3 øu 4 / 0 20 40 60 Aging period (days) Figure 14. Change of water content, migrating from water phase into surfactant phase, with varied pH with time

WATER-IN-OIL EMULSIONS 301 4O 38 1 2 3 4 5 6 7 8 9 10 11 pH (water-phase) Figure 15. Effect ofpH on spacings ofsurfactant in gel prepared between Sunsoft O-30B and water. Mixing ratio = 1:4

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