works best when removed before it completely dries [SEP] this clay mask is nice because it is sheer enough so that it doesn t harden and become too stiff and uncomfortable it is lightly scented with a clean fragrance that smells pleasant when applying this to my face the directions state to leave on for minutes and then to rinse it off before it is completely dry i have noticed that if i do leave this mask on long enough for it to completely dry it develops an unpleasant scent that smells like sulfur when i go to remove it