Tintypes are a type of photograph made by creating a direct positive on a thin sheet of metal, usually iron. This process was popular in the mid-19th century, particularly during the American Civil War. The images are characterized by their dark, metallic surface and are often associated with portraits of everyday people. The tintype process involves coating the metal plate with a light-sensitive emulsion, exposing it in a camera, and then developing it using chemicals. Unlike other photographic methods, tintypes are relatively durable and can be produced quickly, making them a favored choice for traveling photographers and studio portraits.