Tuesday, October 23, 2012

Infrared Photography



 The origins of infrared photography started as early as 1800 with Sir Frederick Wiliam Herschel.  Using colored filters to view sunlight and seeing that some colors had different reactions to heat, he concluded that colors themselves actually have different temperatures.  Looking through a glass prism, and no he noted that the temperature beyond the red colored light (with no sunlight) had the highest temperature, but was invisible to the naked eye. What Herschel described as “calorific rays” to this particular type of radiation, we refer to today as “infrared”.  Jumping over 100 years later in 1910,  the first known infrared photographs were produced by American physicist and Professor, Robert Williams Wood in 1910. Though there were infrared spectrograms produced before 1910, Wood is credited for the first infrared images in print. His first images were published in the October 1910 Journal of the Royal Photographic Society.

Infrared photos by Robert Williams Wood as seen in the Illustrated London News, 1911 / (c) Mary Evans Picture Library

   

     Twenty years after Wood produced the first infrared images with sensitized plates, the first commercial infrared film became available in the 1930’s courtesy of Kodak.  The film is sensitive only to light in the infrared spectrum, the human eye cannot see it, and a special filter is required for utilization of the film. It became popular with photographers trying experimental films, as well as huge in the 60s where many recording artists used the film on their album covers.   One example of color infrared film was Kodak Aerochrome. The film was originally used during the Cold War as a military surveillance tool, and was manufactured for camouflage detection in the hills. Like much from the analogue ways of photography, infrared film was discontinued in 2007 from Kodak, due to a lack of demand and cheaper alternatives with digital technology to produce the same effects. Despite it's demise and difficulty to find today especially with the expiration dates, photographers have still used the film to capture amazing details and, in Richard Mosse's vision, uses the film's unique qualities for his series on the country of Congo. For more on Richard's work, click here. When taking a photo with this film, foliage and plant life will appear magenta or red, and painted objects may turn purple or blue. 
                                       

Photo: “Nowhere to Run, South Kivu, Eastern Congo, 2010” by Richard Mosse, from the series titled Photojournalism at the Crossroads
Photo: (c) Elliott Landy, Bob Dylan, Woodstock, NY, 1968

     Early uses were for scientific purposes; such as aerial survey work, criminology, medical fields, and  space exploration.

Photo: STS068-205-020 Houston, Texas, U.S.A. October 1994



           Overall, infrared photography is unique in that  with with careful use and if the settings are all correct, it can detect detail in the film that normally the eye could not see. It will detect heat or “breathing” from a living organism, as well as haze produced by the long-wavelength radiation that they can emit. Shooting with infrared film requires a red filter, in order to achieve the desired affects.
Grass and leaves look like they are covered in snow and almost seem to have a glowing effect – especially clouds. The film must be loaded and unloaded in total darkness unlike other traditional films, and the shelf life is about half of regular films. Cameras that have a window on the back to indicate the film canister need to be covered with light tight material in order to prevent fogging and unintended exposure to light.



Thursday, October 18, 2012

Cyanotypes



Cyanotypes

The cyanotype was invented in the mid-19th century, but came to prominence a bit time later and remained popular up until 1920. Cyanotypes can be easily identified by their blue tint. This blue color, called Prussian blue, develops from the mixture of chemicals placed on a photosensitive surface, upon which is placed the object to be photographed, covered with a sheet of glass, and is then exposed to light. Once the paper is exposed, it is washed in water; everything but the iron residue, or Prussian blue, is washed away, bringing out the image with its identifiable blue tint (http://www.getty.edu/art/gettyguide/artObjectDetails?artobj=71365). Cyanotypes are most often seen on paper, but can be put onto a number of different materials, like fabric and wood.

Sir John Herschel developed the cyanotype process in 1842; he meant the cyanotype to be used mainly as a means of reproducing notes and diagrams.  Anna Atkins can be credited with bringing the cyanotype to prominence as a form of photography with the publishing of her book, British Algae: Cyanotype Impressions in 1843; this was the first photographically-illustrated book to be published (Ware 2004).
       Chordaria flagelliformis.
Anna Atkins; and Anne Dixon
British, London, 1853
Cyanotypes
10 x 7 7/8 in.
84.XO.227.45
J. Paul Getty Museum

While most well-known for use in botanical photography by people like Anna Atkins, cyanotypes were primarily taken by amateur photographers between 1880 and 1920, which lends a note of interest to their subjects and compositions. This was an inexpensive way for amateur photographers to perfect their art, and the subjects of cyanotypes from this time period are varied, though many depict daily human life (http://www.consortiumlibrary.org/blogs/archives/2010/08/23/photos-in-the-archives-cyanotypes/). 
Native Alaskan couple
Archives at the UAA/APU Consortium Library

The cyanotype process was very popular with engineers, as it could be used to reproduce large-scale copies of their works, otherwise known as blueprints. The blueprint process never changed from its inception in 1842, and was only made obsolete when recently replaced with the widespread use of photocopiers.
Cyanotypes have very interesting preservation and conservation needs. It is not recommended to place cyanotypes on or near traditional acid-free museum stock, as the paper can cause degradation of Prussian blue, which does not like alkaline environments. Fading cyanotypes can actually be restored to almost full color by allowing them to sit in a dark space. The Connecticut State Library says that a " faded cyanotype might be restored if put back in a dark, airy, well-humidified environment for 5 days and then move it to a dark, airy, drier environment" (http://www.cslib.org/PresTakingCare.htm).

And in case you're interested, here's a link to a video showing how to make a cyanotype! http://www.youtube.com/watch?v=9q8N_KgH8SI


http://www.consortiumlibrary.org/blogs/archives/2010/08/23/photos-in-the-archives-cyanotypes/
http://www.cslib.org/PresTakingCare.htm
http://www.getty.edu/art/gettyguide/artObjectDetails?artobj=71365
Ware, Mike. Ag+ Photographic. Vol 7, pp 74-81. 1995, Revised 2004.
Magee, Spike. "Cyanotype history- John Herschel's Invention." http://www.alternativephotography.com/wp/history  
        /cyanotype-history-john-herschels-invention. Accessed 18 October 2012.