Oil-in-oil emulsion
Most cosmetic emulsions involve water and oil, but specialized systems can contain two different non-aqueous liquid phases.
An oil-in-oil system requires the two liquid phases to have sufficiently different physicochemical properties to remain immiscible.
Such systems are considerably less common than oil-in-water and water-in-oil emulsions.
Formulation Considerations
Specialized surfactants or structuring agents may be required to stabilize the interface between the two oil phases.
The terminology should always be accompanied by a description of the actual phases because the term "oil" can refer to materials with very different polarity and chemical composition.
Applications
Oil-in-oil systems may be investigated for specialty delivery systems or unusual sensory effects, but they are not a standard structure for most skincare, haircare or color cosmetic products.
References
Barel, A. O., Paye, M. and Maibach, H. I. Handbook of Cosmetic Science and Technology.
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