| http://www.w3.org/ns/prov#value | - It is also possible to use, for example, coloured (e. g. yellow-, orange-, red-, blue-, green-, brown-, white-, grey-or black-pigmented) plastics or also other synthetic or natural materials such as steel, aluminium or other metals, or also paper (see Proceedings of SPIE Vol. 5380/04A 25GB paper disk).
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