NIC Cosmetology Written (Theory) ExamScientific ConceptsMedium
A cosmetologist is reviewing the ingredients of a new shampoo. One of the key ingredients is a surfactant. What is the primary function of a surfactant in a shampoo or cleansing product?
- ATo provide a pleasant fragrance
- BTo thicken the product's consistency
- CTo add shine and luster to the hair
- DTo create lather and emulsify oil and dirt
Show answer & explanationAnswer & explanation
Correct answer: D. To create lather and emulsify oil and dirt
Surfactants (surface-active agents) are cleansing agents that reduce the surface tension between the product and the hair/skin. Their primary function is to lift and emulsify oil and dirt, allowing it to be rinsed away, and they are responsible for creating lather.
Why the other options are wrong
- A. Fragrances are added for scent, not a function of surfactants.
- B. Thickening agents are used to adjust consistency, not surfactants.
- C. Shine and luster are typically provided by conditioning agents or silicones, not primarily by surfactants.
Surfactant
A surface-active agent that reduces the surface tension between two liquids or between a liquid and a solid. In shampoos, they create lather and help to emulsify and lift dirt and oil for rinsing.
- Reduces surface tension
- Creates lather
- Emulsifies oil and dirt
- Primary cleansing agent
Memory trick: Surfactants Stir, Separate, and Suds.