Face mask beauty treatments are among the oldest cosmetic preparations. Current interest in the development of these formulations is attributed to their warmth, tight- ening, and cleansing effects. Characteristics such as ease of application and removal, reduced time for drying and hardening, and dermatological innocuousness are also required (1-3). One of the most popular face masks is the wash-off type based on clay raw materials, also known as clay facial masks or the once-fashionable "mud packs" (1). Cosmetic science and aesthetic medicine have been rekindling interest in clay facial masks mainly due to clay properties such as particle size, cooling index, high adsorption/ absorption capacity, and plasticity (4-6). Clay facial masks are composed of a high percentage of solid particles (over 25%) dispersed in a liquid vehicl