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 a lot of techniques to utilize for specific processes. Among these would be the cyanotype, which is alternatively called blueprinting. It is also the oldest photographic process that is non silver. Having the materials exposed and treated with solutions that are potassium ferricynide in origin together with ferric ammonium citrate towards the sun is what this process entails.
By blocking the UV light from the sensitized material, both negative or positive images can be obtained. The paper itself will retain the image after it has been thoroughly rinsed with water. After it dries up, the exposed parts will turn a certain shade of blue, while the other parts will remain with the default color.
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.
These are dyes that are suspended in leuco form and will appear colorless until the moment comes when they are exposed to the UV . The usage therefore resembles the cyanotype, although they have notable differences in them as well. Primarily, these are used on textiles and will exist in full ranges of colors.
The time for exposure may vary from either three minutes to as much as fifteen. It will depend on the desired color and the level of intensity displayed by the light. After exposure, the material has to be washed using water and soap so the dye can be 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 usable for coating the surface before it can be dried in a condition with low brightness. The gelatine layer needs to be secure and in tight contact with with translucent positives since its to be exposed to sunlight for about thirty minutes. The light and potassium dichromate will, at this point, tan the gelatine
The plate can be developed by washing it with warm water and having the untanned gelatine removed. After it is dry, the relief print is now revealed on the plate itself. This surface can be inked and then printed if a mass production of identical prints is needed. These, along with sun sensitive paper is all that is needed to accomplish these techniques.
There are a lot of techniques to utilize for specific processes. Among these would be the cyanotype, which is alternatively called blueprinting. It is also the oldest photographic process that is non silver. Having the materials exposed and treated with solutions that are potassium ferricynide in origin together with ferric ammonium citrate towards the sun is what this process entails.
By blocking the UV light from the sensitized material, both negative or positive images can be obtained. The paper itself will retain the image after it has been thoroughly rinsed with water. After it dries up, the exposed parts will turn a certain shade of blue, while the other parts will remain with the default color.
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.
These are dyes that are suspended in leuco form and will appear colorless until the moment comes when they are exposed to the UV . The usage therefore resembles the cyanotype, although they have notable differences in them as well. Primarily, these are used on textiles and will exist in full ranges of colors.
The time for exposure may vary from either three minutes to as much as fifteen. It will depend on the desired color and the level of intensity displayed by the light. After exposure, the material has to be washed using water and soap so the dye can be 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 usable for coating the surface before it can be dried in a condition with low brightness. The gelatine layer needs to be secure and in tight contact with with translucent positives since its to be exposed to sunlight for about thirty minutes. The light and potassium dichromate will, at this point, tan the gelatine
The plate can be developed by washing it with warm water and having the untanned gelatine removed. After it is dry, the relief print is now revealed on the plate itself. This surface can be inked and then printed if a mass production of identical prints is needed. These, along with sun sensitive paper is all that is needed to accomplish these techniques.
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