Lightweight, thin tintypes could be carried
conveniently in a jacket pocket. They became very popular in the United
States during the American Civil War.
Although prints on paper soon displaced them as the most common type of
photograph, the tintype process continued to enjoy considerable use
throughout the 19th century and beyond, especially for casual
portraiture by novelty and street photographers.
Contemporary usage: Tintypes have been taken in Afghanistan during the War on Terror by U.S. Air Force airmen, apparently the first taken in a war zone since the Civil War.