A daguerreotype (original French: daguerréotype)'s an early type of photograph, developed by Louis Daguerre, in which the image's exposed directly onto a mirror-polished surface of silver bearing a coating of silver halide particles deposited by iodine vapor. In later developments bromine and chlorine vapors were also used, resulting in shorter exposure times. The daguerreotype's a negative image, but the mirrored surface of the metal plate reflects the image and makes it appear positive i… (More on Daguerreotype)