| http://www.w3.org/ns/prov#value | - As representative examples of materials which are generally electropositive (these materials impart a negative charge to the toner), there may be mentioned: glass, metal oxides, such as calcium oxide, titanium oxide, iron oxide, calcium titanate, etc.; metals, such as lead, nickel, copper, etc.; ferrite; polymers such as ethyl cellulose, acrylic polymers, acrylate polymers, etc.; and the like.
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