da guerre o type Image produced on a silver-coated copper plate.
Sensitizing agent:iodine,developing agent:mercury.
Invented by Frenchman Louis-Jacque-Mande Daguerre
Am bro type: Negative image produced on a glass plate,viewed as a positive by the addition of a black backing. Sensitizing agent:Silver nitrate;developing agent:pyrogallic acid.Invented by Frederick Scott Archer (Britain) and popularized by James Cutting (United States).
Introduced 1854 Peak years 1857-1859 Waned 1861-1865 .
Tin type (also called melainotype and ferrotype):Negative image produced on a thin iron plate,viewed as a positive due to undercoating of black japan varnish. Sensitizing agent:silver nitrate:developing agent: pyrogallic acid. Invented by Hamilton Smith. Pattened by Peter Neff ( united States).Introduced 1856 Peak years 1860-1863 Waned 1865-1867
The last tintypes to be contained in cases were produced around 1867,marking the end of cased images. Tintypes were produced in various other forms until about 1930.