The 2007 article mentions that the Lumina substrate consisted of a layer of polymer sandwiched between two layers of paper, and had the advantage that the polymer could carry a COLORED watermark. Is it known whether the recently discovered GOG 0168401 has a colored watermark? Am i correct that there are now TWO such Lumina notes known??
(PS: Can anyone send me nice high-res images of the Macklem $5 and 410 notes?) Bernard Schaaf