Which two handling instructions are appropriate for emulsions?

• A. Store in direct sunlight and do not shake
• B. Tightly closed container and shake well
• C. Refrigerate at all times
• D. Open container and shake vigorously

Answer: (B)

Emulsions mix two immiscible liquids and stay stable only with the right handling. Keeping the container tightly closed protects the product from air, moisture, and contamination, helping preserve its stability and shelf life. Shaking well before use re-disperses the droplets so the product is uniform each time you apply it, preventing variability in dose or texture. Storing in direct sunlight can degrade light-sensitive ingredients and destabilize the emulsion, while refrigerating all the time isn’t appropriate for every product and can change its feel or stability. Opening the container and shaking vigorously introduces air and contaminants and can accelerate instability.