Most cheap reprints of 1800s color lithograph signs will have a multi-color dot matrix throughout it-- at least the image area. Can bee seen under strong magnification. An original 1800s color litho image can have some dots and marks as part the art design, but a lot of areas of solid color-- and definitely not the fine dot matrix pattern. 99 percent of reprints are identified by the modern multi-color dot pattern.
As far as the 'thick paper' goes, I have an original 1800s lithograph Sweet Caporal sign. It's on cardboard, but thin by today's standards. And the back is fairly white.
Last edited by drc; 08-04-2012 at 12:01 PM.
|