Fuller''s Earth
Fuller's Earth, an earthy substance resembling potter's clay, but lacking its putty-like quality. In powdered form it acts as a spot remover, because of its great absorbency. Its name is derived from its traditional use as a cleaner in the fulling of wool. It consists largely of attapulgite and montmo-rillonite clays (a mixture of aluminum, silicon, and magnesium oxides). In color, it ranges from grayish through blue and from green to brown. It is converted into powder form by drying and milling.
Fuller's earth is often used to remove color from oils and other liquids and is an important ingredient of filters, pigments, insecticides, and cosmetics.