Fuller's earth Powder 12 oz by Humco. (Lot of 8 Bottles) Filter Medium, Decolorizer, Absorbent, Polishing Agent. Fuller's earth can be found in skin care products, such as facial clays and masks used to fight wrinkles and treat acne. It's also used in cosmetics to bind other ingredients, to keep other powders from caking together, to provide gentle exfoliating properties, or to otherwise stabilize products. Fuller Earth Powder Also called "Multani Mitti" मुल्तानी मिटी in Indian National language Hindi.