What are the three preparations of emulsions?

• A. dry gum (continental) method; wet gum (English) method; Bottle or Forbes bottle method
• B. dry gum method only
• C. wet gum method only
• D. bottle method only

Answer: (A)

Emulsion preparation relies on how the emulsifier is brought into contact with the oil and water. The three classic practical methods are the dry gum (continental) method, the wet gum (English) method, and the bottle or Forbes bottle method. In the dry gum method, gum is first mixed with the oil to form a paste, then water is added in portions with vigorous mixing to create the emulsion. In the wet gum method, the gum is first wetted in water to form a mucilage, and oil is added slowly with steady agitation, followed by the remaining water to complete the emulsion. In the bottle method, oil, water, and a small amount of gum or mucilage are placed in a bottle and shaken vigorously until an emulsion forms, with final volume adjusted as needed. These three approaches are the standard ways to prepare emulsions in practice, covering the main techniques used across different compounding scenarios.