![]() The surface is very delicate, and even the lightest wiping can permanently scuff it. The darkest areas of the image are simply bare silver lighter areas have a microscopically fine light-scattering texture. ![]() The image is on a mirror-like silver surface and will appear either positive or negative, depending on the angle at which it is viewed, how it is lit and whether a light or dark background is being reflected in the metal. ![]() To make the image, a daguerreotypist polished a sheet of silver-plated copper to a mirror finish treated it with fumes that made its surface light-sensitive exposed it in a camera for as long as was judged to be necessary, which could be as little as a few seconds for brightly sunlit subjects or much longer with less intense lighting made the resulting latent image on it visible by fuming it with mercury vapor removed its sensitivity to light by liquid chemical treatment rinsed and dried it and then sealed the easily marred result behind glass in a protective enclosure. ![]() Congressman-elect in 1846, attributed to Nicholas H. The first authenticated image of Abraham Lincoln, a daguerreotype of him as U.S. ![]()
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