Security sheet or document having one or more enhanced watermarks

摘要: The invention generally relates to a security sheet or document having one more enhanced watermarks. In exemplary embodiment, the inventive is single-ply paper that made up of layer including watermarks, and micro-optic device (e.g., patch thread) at least partially covers an upper face portion watermark(s). overlying thread increases durability watermark(s), thereby allowing for watermark(s) as well reduced fiber density areas therein be larger, further thinner. preferred projects synthetic images coordinate link in with watermark design(s). offers machine detectable/readable feature form IR-brightness, especially when measured transmission. As will readily appreciated, greatly improved counterfeit-resistance.