Daguerreotype

Daguerreotype

Daguerreotype is an early photographic process named after its inventor, Louis-Jacques-Mandé Daguerre, and introduced in 1839. It was the first commercially successful photographic process and remained popular for about two decades. The process involved exposing a polished silver-plated copper sheet to iodine vapor, creating a light-sensitive silver iodide surface. The plate was then exposed to light in a camera obscura, with exposure times ranging from a few seconds to several minutes, depending on the lighting conditions. The exposed plate was then developed over heated mercury vapor, which adhered to the silver iodide in proportion to the amount of light exposure, creating a visible image. The image was then fixed with a solution of sodium thiosulfate or salt to remove the remaining silver iodide, making it insensitive to further light exposure. The resulting image was a highly detailed, one-of-a-kind photograph on a silver-plated copper sheet, with the image appearing as a positive when viewed at a specific angle and as a negative when viewed from a different angle. Daguerreotypes were usually mounted in protective cases due to their delicate nature and were prized for their exceptional clarity and detail.

photography, silver-plated copper, mercury vapor, camera obscura, light-sensitive, 19th century

— John Armstrong