Fuller's earth is also known as 'bleaching clay' because of its inherent bleaching properties. Fuller's earth is non-plastic clay that can be used to decolorize, filter and purify mineral and vegetable oils and greases. It has great commercial importance. Calcium bentonite, more commonly called fuller's earth, has the capability to decolorize oil or other liquids without chemical treatment. This clay possesses a unique combination of physical-chemical properties suiting this to a wide range of industrial applications.