A Daguerreotype - Photographic Process.
12/04/2010
A daguerreotype (original French: daguerréotype) was the first large scale commercial photographic process.
The image in a Daguerreotype is formed by amalgam i.e. a combination of mercury and silver.
The fact that many of those to use the process suffered severe health problems or even death from mercury poisoning after inhaling toxic vapors created during the heating process also contributed to its falling out of favor with photographers.
Article.