Review title is 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 5-10 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.