Dating antique prints updating web pages with ajax
This difference in process can usually be spotted by an expert and in some cases is quite obvious.
Most reproductions are made from a dot-matrix or half tone process, which produces a lentiginous image composed of a symmetrical pattern of small dots..
Wove paper, in contrast, is made on a woven belt and lacks the laid lines.
The most definitive method of determining whether a print is an original or a reproduction is by examination of its production process.
All reproductions are made by a different process than originals; reproductions are photomechanically produced and originals are not.
Note that old prints do vary a bit in size, but the measurements should be within about 1/4” of the recorded size.
Many prints and maps were issued in bound volumes and if the item is large, then it will often have to have been folded to fit into the volume.