There are are various printing techniques where sunlight is a critical factor. These processes are called sun printing, which makes use of sun sensitive paper in all of the endeavors. Another common thing they all have in common would be their use of sunlight as a fixative or developing agent.
There are several techniques that can be used for these processes. One such technique is called cyanotype. It is also known as blueprinting and it happens to be the oldest non silver photographic process in existence. This technique involves the exposure of materials that have been treated with solutions of potassium ferricynide and ferric ammonium citrate to the sun, which is a UV source.
Blocking UV light from sensitized material can achieve positive images as well as negative. It will likely retain the image even after a thorough rinsing with water. After it has dried up, the exposed part may turn a particular shade of blue as the remaining parts remain the same color by default.
Another method would be to utilize Inkodye, which is a special vat dye type. This is to be used for the process because it possesses a certain light sensitive quality. Instead of being developed by oxygen, the colors of Inkodyes is developed by light in its place.
The colorless form, which is originally colorless, will be improved upon when exposed to UV light compared to what it was when suspended in leuco form. As far as usage is concerned, it resembles cyanotype but with some notable differences. Chief among them would be the fact that it can be utilized on textiles and has a full range when it comes to color.
The exposure time will vary between three to fifteen minutes. It would depend on what the desired color is or the level of intensity displayed by the light. After being exposed, the sensitized material must be washed with soap and water so that the dye is removed from the unexposed areas.
Another method of sun printing will refer to the photographic process that makes use of potassium dichromate. This is known to produce a negative plate for lithographic printing. A film of gelatine is used by this process and is to be spread all over a surface that is flat and rigid.
Potassium dichromate in a dilute solution is being used to coat the surface before being dried in conditions with low brightness. The treated gelatine layer is to be secured in tight contact with a translucent positive as it is exposed to sunlight over a period of half an hour. At this point, both the light and the potassium dichromate will tan the gelatine being exposed to the light.
Removing and washing out the untanned gelatine with the use of warm water can allow development for the plate. Once it is dry, on the plate will be the revealed relief print. The surface has the capacity to be inked and then printed should there be a need to produce a mass amount. Sun sensitive paper can be considered just one tool within these various techniques that will require tons of effort.
There are several techniques that can be used for these processes. One such technique is called cyanotype. It is also known as blueprinting and it happens to be the oldest non silver photographic process in existence. This technique involves the exposure of materials that have been treated with solutions of potassium ferricynide and ferric ammonium citrate to the sun, which is a UV source.
Blocking UV light from sensitized material can achieve positive images as well as negative. It will likely retain the image even after a thorough rinsing with water. After it has dried up, the exposed part may turn a particular shade of blue as the remaining parts remain the same color by default.
Another method would be to utilize Inkodye, which is a special vat dye type. This is to be used for the process because it possesses a certain light sensitive quality. Instead of being developed by oxygen, the colors of Inkodyes is developed by light in its place.
The colorless form, which is originally colorless, will be improved upon when exposed to UV light compared to what it was when suspended in leuco form. As far as usage is concerned, it resembles cyanotype but with some notable differences. Chief among them would be the fact that it can be utilized on textiles and has a full range when it comes to color.
The exposure time will vary between three to fifteen minutes. It would depend on what the desired color is or the level of intensity displayed by the light. After being exposed, the sensitized material must be washed with soap and water so that the dye is removed from the unexposed areas.
Another method of sun printing will refer to the photographic process that makes use of potassium dichromate. This is known to produce a negative plate for lithographic printing. A film of gelatine is used by this process and is to be spread all over a surface that is flat and rigid.
Potassium dichromate in a dilute solution is being used to coat the surface before being dried in conditions with low brightness. The treated gelatine layer is to be secured in tight contact with a translucent positive as it is exposed to sunlight over a period of half an hour. At this point, both the light and the potassium dichromate will tan the gelatine being exposed to the light.
Removing and washing out the untanned gelatine with the use of warm water can allow development for the plate. Once it is dry, on the plate will be the revealed relief print. The surface has the capacity to be inked and then printed should there be a need to produce a mass amount. Sun sensitive paper can be considered just one tool within these various techniques that will require tons of effort.
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This article collected, selected and written by: Author Van Hoc
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