作者: Vladimir P. Raksha , Paul G. Coombs , Charles T. Markantes , Neil Teitelbaum
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摘要: The invention discloses security articles printed with an opaque or semi-transparent magnetic scratch-off removable composition on a substrate. article allows one to determine if the media has been substantially removed prior awarding prize. Furthermore label having image that is formed by applying magnetically alignable pigment aligned field. A region of more than another adjacent it, so verification can be made and its contents.