Colorado Esthetician Written Practice Exam

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What substance is commonly used to emulsify oil and water in products?

Surfactants
Solvents
Binders
Preservatives

The correct answer is: Surfactants

Surfactants are the substances commonly used to emulsify oil and water in products. Surfactants have both hydrophilic (water-attracting) and lipophilic (oil-attracting) properties that allow them to bring together oil and water molecules that would typically separate. This helps in creating stable emulsions in various skincare products. Solvents are used to dissolve other substances but do not emulsify oil and water. Binders are materials that hold ingredients together and do not typically have emulsifying properties. Preservatives, on the other hand, are used to extend the shelf life of products by inhibiting the growth of microorganisms and do not have emulsifying properties.