Which of the following is NOT a function of kaolin?

Kaolin, also known as china clay, is a type of clay widely used in skincare products for its various beneficial properties. It is primarily recognized for its ability to absorb excess oil from the skin, making it particularly effective for oily and acne-prone skin types. Additionally, kaolin has a gentle exfoliating action due to its fine texture, helping to slough off dead skin cells without causing irritation. It also has calming properties, which can help soothe skin irritations and redness.

The assertion that kaolin provides astringent and toning effects is not accurate. Astringents are typically substances that cause tissues to contract or constrict, often found in products designed to tighten the skin or minimize the appearance of pores. While some clays may have mild astringent properties, kaolin is not primarily recognized for this functionality. Instead, it serves more to absorb oil and calm the skin rather than toning. Hence, the choice that states kaolin has an astringent and toning effect is not aligned with its well-established characteristics.