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The technique of making such enlargements were so complicated that few photographers had the proper skill to make an enlargement from a standard studio negative.
Much of the demand for larger photographs could be satisfied by making larger negatives and larger cameras to handle them.
It was no longer necessary to visit a studio that specialized in the tiny likeness.
Gem portraits were commonly stored in special albums with provision for a single portrait per page. Some Gems were cut to fit lockets, cufflinks, tie pins, rings and even garter clasps. Itinerant photographers frequently brought the tintype to public gatherings, such as fairs and carnivals.
Flaws that were not obvious in the smaller cards now became very visible. Success in retouching led to innovations in the darkroom and at the camera.
Diffusion of the image reduced the need for retouching. Blue playing card stamps are known to have been used in the summer of 1866 as other stamps were unavailable as the levy came to an end.
Apparently Talbot (the inventor) did not fully realize the importance of washing his prints long enough to remove all the residual chemicals, or perhaps his fixing was inadequate. Instead of a glass cover, the photographer covered the tintype with a quick varnish to protect any tints or colors added to cheeks, lips, jewelry or buttons.
Uncased tintypes have been found with canceled tax stamps adhered to the backs. Neither the chocolate tint nor the rustic look are to be found in pre 1870 tintypes. Tiny portraits, 7/8 by 1 inch, or about the size of a small postage stamp, became available with the invention of the Wing multiplying cameras.These defects are now noticeable in many calotypes, some of which are today little more than pale yellow ghosts. They could be mailed home safely without fear of shattering.AMBROTYPE (1854 to the end of the Civil War)The ambrotype is a thin negative image on glass made to appear as a positive by showing it against a black background. It couldn't withstand travel or being carried in a locket as a daguerreotype could. The tintype actually does not contain any tin, but is made of thin black iron.The giant spaces they discovered demanded giant cameras.The camera that documented the famous meeting at Promontory Point, Utah of the tracks of the Central Pacific and Union Pacific railroads on was built to accommodate glass plates 10" x 13".