| http://www.w3.org/ns/prov#value | - The materials that may be used include, but are not limited to, black, white or colored glass, TEFLON???, polyethylene, high density polyethylene, polypropylene, polystyrene, polyester, ceramic, such as alumina or zirconia, metal, or any composite of the above materials or any material that is physically or chemically structured to produce optical contrast as the result of exposure to the write pr
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