| http://www.w3.org/ns/prov#value | - Some of the enhancing agents well known to those skilled in the art include the oxides and halides of the metals of groups IVA and VA of the Periodic Table such as the oxides and halides of antimony, bismuth, arsenic, tin, lead, and germanium; antimony oxychloride, antimony chloride, antimony oxide, stannic oxide, stannic chloride, arsenous oxide, arsenous chloride, and the like are enhancing agen
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