Quote Originally Posted by Photo Engineer View Post
At GEH they are making glass frames that can contain a Daguerreotype under an inert atmosphere so as to preserve them. It does appear that air and air pollutants are involved, but again, no one seems to know the mechanism and no one knows how to restore one AFAIK.

Have you seen Barger and White, The Daguerreotype; Nineteenth-century technology and modern science, 1991? It addresses some of those issues plus restoration. I think it might be yoru kind of book... lots of science and technology.