But what does this really mean?ġ- You can not measure the pH of a W/O emulsion after it is made
#OIL IN WATER EMULSION SKIN#
So far, so good and this is clear to every elementary student of skin care. The nature of the emulsifier determines whether an emulsion is O/W or W/O and NOT the order of adding one phase to the other phaseĪnyway there are some fundamental differences (in manufacturing procedure, application and properties) and we're going to list them just as a reminder:Īlthough emulsions have various structures, in a very general way imagine a W/O emulsion as water droplets dispersed in an oil external phase and an O/W emulsion as oil droplets in a water external phase. But this is out of the scope of this post. But these phase-inversed emulsions fall apart in a few minutes and are not stable. The emulsion that should be a W/O turns to an O/W emulsion and vice versa during the emulsification (this can happen because of temperature, stirring or certain additives). There is a phenomenon called phase inversion and this happens to some emulsifiers. Except for lecithin, with which you can create both types of emulsions under certain circumstances, you can not use a W/O emulsifier to create an O/W emulsion. W/O emulsifiers and O/W emulsifiers have different natures and different HLB ranges. It dictates which emulsion you're making. Well, the main difference or the cause of the difference is the nature of the emulsifier. Everybody who has made just one simple emulsion should know the difference between a water in oil and an oil in water emulsions but since repetition never hurts and since we still receive questions and inquiries that go back to the root of this difference I thought I may dedicate a short post and video to this question again.īefore you proceed please go an read this post that I wrote about a year ago Natural emulsifiers 101
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