| http://www.w3.org/ns/prov#value | - In one embodiment, a method for enhancing the useful life of paper, archival materials, prints, photos, currency, valuable documents such as passports, fabric, art work and other products, comprises (a) preparing nanoscale or submicron powders comprising rare earth metals by any method, such as a method including a step operating above 1000 K and having a process stream velocity above 0.25 mach; (
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