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- May 29, 2007
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- Epson SC-P800,WF-7840,XP-15000
Als a scientist I would wonder if it would be possible to formulate special dye inks which when printed on a special coated fotopaper would react with a chemical agent of which the paper has been coated with to form a insoluble and fade- and waterfast pigment. The idea behind this is that most Canon printers would only accept dye ink for photoprinting and overtime the images will fade away inevitably.
To overcome this problem, their are two possible solutions for dye-based Canon printers:
-use pigment ink in the BCI-6/CLI-8 cartridges: so far I know their is no reliable pigment ink to have the same printing properties like dye ink (causing blobs and messy prints) and in the worst case your printhead will be ruined.
-use dye ink which overtime precipitates with a special chemical on the photopaper to form a pigment deep inside the paper, which would make it superior to normal pigment ink, since the ink could be used on swellable paper too. And since pigment are not just on the paper but in fact formed deep inside the paper, the fade resistance would be superior to normal pigment ink and metamerism is drastically reduced, which is well known problem with normal pigment ink. And the ink can not flake of the surface when the paper is repeatedly bended as in the case of normal pigment ink on swellable paper.
The downside of this concept would be the photopaper should be specially treated with the precipitation chemical and might be more expensive or use special sprays to be sprayed on the paper before or after printing to initiate this precipitation process.
The idea of my concept is born by the principal of the pigment forming process of the good old iron gall ink, which contains a mixture of gallic and/or gallotannic acid and ferrous sulphate (Fe2+). This mixture is completely soluble and even colourless and other temperary colourants had to be added to make the ink visible (for example soluble blue dye). After writing on paper the Fe2+ ions or oxidised by atmospheric oxygen to Fe3+ which precipitates with the gallic acid to form a insoluble deep black pigment which can not be erased from the paper by normal means, only by actually scraping off the surface of the paper. This ink is also known as permanent blue-black writing ink (writing blueish, turning overtime into a deep indelible black).
By separating both agents the precipitation process is blocked making it possible to make a true dye-based ink, which could be easily sprayed by a dye-based Canon printhead without danger of clogged nozzles.
Any ideas from guys with chemical knowledge as well ?
To overcome this problem, their are two possible solutions for dye-based Canon printers:
-use pigment ink in the BCI-6/CLI-8 cartridges: so far I know their is no reliable pigment ink to have the same printing properties like dye ink (causing blobs and messy prints) and in the worst case your printhead will be ruined.
-use dye ink which overtime precipitates with a special chemical on the photopaper to form a pigment deep inside the paper, which would make it superior to normal pigment ink, since the ink could be used on swellable paper too. And since pigment are not just on the paper but in fact formed deep inside the paper, the fade resistance would be superior to normal pigment ink and metamerism is drastically reduced, which is well known problem with normal pigment ink. And the ink can not flake of the surface when the paper is repeatedly bended as in the case of normal pigment ink on swellable paper.
The downside of this concept would be the photopaper should be specially treated with the precipitation chemical and might be more expensive or use special sprays to be sprayed on the paper before or after printing to initiate this precipitation process.
The idea of my concept is born by the principal of the pigment forming process of the good old iron gall ink, which contains a mixture of gallic and/or gallotannic acid and ferrous sulphate (Fe2+). This mixture is completely soluble and even colourless and other temperary colourants had to be added to make the ink visible (for example soluble blue dye). After writing on paper the Fe2+ ions or oxidised by atmospheric oxygen to Fe3+ which precipitates with the gallic acid to form a insoluble deep black pigment which can not be erased from the paper by normal means, only by actually scraping off the surface of the paper. This ink is also known as permanent blue-black writing ink (writing blueish, turning overtime into a deep indelible black).
By separating both agents the precipitation process is blocked making it possible to make a true dye-based ink, which could be easily sprayed by a dye-based Canon printhead without danger of clogged nozzles.
Any ideas from guys with chemical knowledge as well ?
