Properties of emulsion
From Pharmpedia
The basic properties which should be present in an emulsion include appearance, feel, odour, desirable viscosity, consistency, effectiveness and stability. These properties depends on the ingredients, type of emulsion, ratio of the two phases, type and quantity of emulsifying agents and method of emulsification . O/w emulsions will generally have a sheen or matte surface as compared to w/o emulsions which have a shiny or oily surface due to the presence of oil as external phase. W/o emulsions are oily and greasy in nature, not easily removable from the surface of the skin whereas o/w emulsions are non greasy and easily removable from the skin surface. The viscosity of the emulsions depends generally on the viscosity of the continuous phase. As the ratio of dispersed phase increases, the viscosity also increases to a point where emulsion starts loosing its fluidity.
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