Definitions for "Plate Mark"
The imprint in the paper resulting from the edge of a metal plate being pushed into it during the pressure of the printing process.
In intaglio prints the pressure of the press causes the plate to leave a mark of it's surface dimensions upon the paper.
The indented line that occurs around a printed image caused by the intense pressure of the press on the plate and thence onto the dampened printing paper.
Keywords:  plein, platinum, air
Platinum Plein Air