What is the term? - It's the alteration done to a stamp in order to add perforations to 1 or more of its edges.
Again, What is the term? - It's the alteration done to a stamp in order to add perforations to 1 or more of its edges.
A form of printing in which the inked image is produced by that portion of the plate sunk below the surface.
OK - here's a challenge that ought to spur some controversy (in terms of which color is which, e.g. your concept of purple isn't the same as mine!) How about posting a picture of three different stamps that show the difference between (1) lavender, (2) violet, and (3) purple.