Which ingredient is commonly used for setting powder in makeup?

The commonly used ingredients for setting powder in makeup typically include talc, silica, or starch because they each possess properties that help absorb excess oil and provide a mattifying effect on the skin. Talc, known for its smooth texture and oil-absorbing capabilities, helps to create a soft-focus effect by blurring imperfections. Silica is often included because of its ability to absorb moisture and excess oil while giving a lightweight feel. Starch, such as arrowroot or cornstarch, is also used for its natural absorbency and smooth application.

These ingredients contribute to the overall performance of the setting powder, ensuring that makeup remains in place while preventing shine throughout the day. By contrast, while cornstarch can be used in some formulations, it is primarily one type of starch, and sodium bicarbonate is not commonly used in makeup compositions aimed at setting products, as it can be too alkaline and may irritate the skin. Rice flour is another natural ingredient used in some powders but does not have the same widespread industry acceptance or effectiveness as a setting agent compared to the combination of talc, silica, or starch.