| http://www.w3.org/ns/prov#value | - Illustrative examples of materials selected for the overcoating layer include selenium, alloys of selenium, such as arsenic selenium, containing 0.1 to 50 percent by weight of arsenic and 99.9 to about 50 percent by weight selenium, arsenic selenium alloys containing halogens, such as chlorine or iodine, in an amount of from about 1 part per million to about 1 percent, as well as selenium telluriu
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