All ink jet printers used in the home and most businesses use a similar formulation.The basic make-up of jet inks is de-ionized water as the solvent, isopropyl alcohol
or glycol as the drying agent, and dye base to provide the colour.These materials as well as proprietary ingredients are mixed in various proportions to form ink jet inks.
Depending on the page speed, printhead design and colour capabilities, the actual proportion of the ingredients will vary. All dye-based ink jet ink formulations lack water resistance.
The introduction of pigmented black inks changed this, instead of using water soluble dye to provide colour, pigmented inks use small particles suspended in the base solution to provide the colour. To keep the particles from settling out of the solution the pigment particles are coated with a polymer material to generate a static charge around the particle, thereby keeping the particles from clumping.
The Main advantages of pigmented inks.
Pigmented ink particles tend to settle into tiny fibres that make up the paper. As the ink dries, the pigment particles get stuck in the fibres. Thus, the pigmented inks are more water-resistant than the dye based inks. Only about 5 to 10 percent of the ink will disolve into the water if the paper is wetted.
Dye-based inks tends to fade quicker, since all of the molecules are exposed to the chemical and sunlight-caused reactions that fade the ink.You may notice fading of dye based inks exposed to direct sunlight commonly in 6-12months.
Pigment particles being "hidden"in the fibres. It is much more difficult for sunlight and chemicals to react with all of the pigment molecules. Pigmented inks therefore will usually last for many years before fading becomes noticeable. Also the small particle size allows sharper image detail on even low-grade paper as the ink is less susceptible to bleeding and wicking on the paper fibres.
Pigmented ink in black tends to have a charcoal appearance and so far colour-pigmented inks do not provide a good colour match to dye based formulations. In addition pigmented inks are very expensive to produce, costing 2-4 times that of dye based inks.
Pigment Ink Vs Dye Ink
A-The features of Pigment Ink
Does not easily dissolve in water, pigment in colloid type is used.Strong Water Fast does not easily decolourize. More permanent that dye. The depth of colour is much thicker.
B.-Benefits of Pigment ink: Water Fastness, Light Fastness,Superior Colour Gamet, and Vivid Colour Impressions.
C-The features and Benifits of Dye Ink
The Ink is entirely dissolved in the solution, Less Water Fast, with a Wider and Bright Colour Vision, Ideal for text and graphics, various general colour applications.
Our Observation is that the world-wide tendency regarding development of inkjet inks is now moving towards Pigment ink, with high water fastness, Light fastness and permanency.