| http://www.w3.org/ns/prov#value | - Further, described is a method of forming a document with at least one image on a paper substrate, wherein the at least one image is substantially not detectable to a naked human eye through differential gloss or exposure to light having wavelengths of 365 nm or more, the method comprising providing a paper having an average surface roughness of at least about 0.5 microns and including one or more
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