Editing Collodion process (section)

{{Short description|Early photographic technique}}
[[Image:Año 1867, negativo de vidrio al colodión, vista de Gerona o Girona, Fototeca del IPCE, Spain.JPG|thumb|1867. Collodion wet plate process. ''[[Girona|GERONA]].- Puente de Isabel II''. [[Ministry of Education, Culture and Sport (Spain)]].]]

The '''collodion process''' is an early [[photography|photographic]] process for the production of grayscale images. The [[collodion]] process – mostly synonymized with the term "'''''wet-plate process'''''", requires the photographic material to be coated, sensitized, exposed, and developed within the span of about fifteen minutes, necessitating a portable [[darkroom]] for use in the field. Collodion is normally used in its wet form, but it can also be used in its dry form, at the cost of greatly increased exposure time. The increased exposure time made the dry form unsuitable for the usual portraiture work of most professional photographers of the 19th century. The use of the dry form was mostly confined to [[landscape photography]] and other special applications where exposure times sometimes longer than a half hour were tolerable.<ref name="Towler">{{cite book |last1=Towler |first1=John |title=The Silver Sunbeam |date=1864 |publisher=Joseph H. Ladd |location=New York |isbn=0-87100-005-9 |url=http://albumen.conservation-us.org/library/monographs/sunbeam/chap36.html |access-date=14 September 2018}}</ref>