Time Laboratories Argiletz French Green Illite Clay is a remineralizing dietary supplement, and also can be used as a facial treatment to purify facial skin. Directions For External Use: Mix with floral water (hydrolat), distilled water, or herbal tea to make a spreadable paste. Add essential oil if desired. Apply the paste as a poultice as needed or use as a weekly facial mask. Refrigerate or discard unused portion.