Sunlight is often a critical factor for several printing techniques. Sun printing, as it is popularly called, can be done in several methods and with different tools and items, one of them being sun sensitive paper. One common thing they share is the utilization of sunlight as a developing agent or a fixative.
There are many techniques that can possibly be utilized for these processes. One way is the cyanotype. To the unaware, it is otherwise called blueprinting and it is also the most dated non silver photographic process to date. It involves exposing the materials that are being treated with potassium ferricynide solutions as well as ferric ammonium citrate to sunlight, which is used as a source of UV.
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.
There is another method that utilizes Inkodye, which is considered to be a specialized vat dye type. It posses a particular quality in light sensitivity, which means it can be utilized in the process. What makes this particular element unique is that the colors are developed with sunlight when it comes to Inkodyes, unlike the oxygen developed colors of other vat dyes.
When it becomes exposed to UV, it improves upon its originally colorless form from when it was still suspended in that leuco form. It will resemble cyanotype in terms of usage but there are some notable differences between them as well. Mainly, these are utilized on textiles and exist in a full range of colors.
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.
There is yet more methods when it comes to sun printing. This one refers to a photographic process that will utilize potassium dichromate. It is known to create a negative plate when it comes to lithographic printing. Films of gelatine will be used in this process and it will be spread over a flat and rigid surface.
Potassium dichromate in dilute solutions can be used for the coating of the surface before it is dried in certain conditions that have low brightness. The treated layer has to be secured and in tight contact, especially with translucent positives as its going to be exposed to the sun for a period of thirty minutes. The potassium dichromate and the light will, at this point, cause the gelatine to tan.
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 many techniques that can possibly be utilized for these processes. One way is the cyanotype. To the unaware, it is otherwise called blueprinting and it is also the most dated non silver photographic process to date. It involves exposing the materials that are being treated with potassium ferricynide solutions as well as ferric ammonium citrate to sunlight, which is used as a source of UV.
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.
There is another method that utilizes Inkodye, which is considered to be a specialized vat dye type. It posses a particular quality in light sensitivity, which means it can be utilized in the process. What makes this particular element unique is that the colors are developed with sunlight when it comes to Inkodyes, unlike the oxygen developed colors of other vat dyes.
When it becomes exposed to UV, it improves upon its originally colorless form from when it was still suspended in that leuco form. It will resemble cyanotype in terms of usage but there are some notable differences between them as well. Mainly, these are utilized on textiles and exist in a full range of colors.
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.
There is yet more methods when it comes to sun printing. This one refers to a photographic process that will utilize potassium dichromate. It is known to create a negative plate when it comes to lithographic printing. Films of gelatine will be used in this process and it will be spread over a flat and rigid surface.
Potassium dichromate in dilute solutions can be used for the coating of the surface before it is dried in certain conditions that have low brightness. The treated layer has to be secured and in tight contact, especially with translucent positives as its going to be exposed to the sun for a period of thirty minutes. The potassium dichromate and the light will, at this point, cause the gelatine to tan.
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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