What is the main effect of mineral masks as they dry on the skin?

Mineral masks are primarily designed to tighten and tone the skin as they dry. This effect occurs because the minerals in the mask can draw moisture from the skin's surface and create a firming sensation, which visibly tightens the skin. The drying process can also enhance the mask's ability to absorb excess oil and impurities, further contributing to a toned appearance.

While some masks may have moisturizing properties, their primary function often leans toward tightening, which is particularly beneficial for both oily and combination skin types. The tightening effect is typically due to ingredients such as clay or certain mineral compounds that constrict pores and reduce the appearance of fine lines, making the skin look firmer and more youthful.

Other options like moisturizing and hydrating, whitening and brightening, or exfoliating and renewing are outcomes associated with different types of masks or treatments but do not encapsulate the primary effect of mineral masks specifically.