Print density

Ink components of the ink composition other than the dye may affect the print density. The non-dye components can control the depth of dye penetration into the receiving media and or the lateral spread of the dye on the receiving media, thus influencing the print density (1). 

Pyrrolidin-2-one and derivatives thereof have been used to influence the performance of the printed ink. For example, a composition has been described that uses a condensate from a polyol and alkylene oxide in combination with pyrroHdin-2-one or l-(2-hydroxyethyl)-2-pyrrolidinone (2). 

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Selenium Intensification Selenium toning causes a slight increase in print density, a form of intensification that gives most prints a richer appearance. The increased density is more noticeable in the shadow areas. If you want to use selenium toning on prints for longevity without noticeable intensification, compensate by reducing the development time of the print by about 10%. 

The quality of the negative plays an important part in the creation of warm tones by direct development. The best results are obtained from negatives of good contrast and printing density. 

Figure 10. Print density (9), show through (A) and set off ( + ) as a function of the amount of ink on the printed sample (48,).

This standard is based on Arrhenius methodology and calls for measuring changes in print density that occur as a function of temperature at 50% + 3% relative humidity. The objective was to examine the dark keeping properties of inkjet photographic prints as a function of constant absolute humidity at various temperatures. The primary focus is on commercially available dye-based inks printed onto both porous and nonporous photo-quaUty papers (9). 

Also, the nature of the colorant, i.e., whether the ink is a dye-based ink or a pigment-based ink, will affect the quality of the printing. A proper fixation of the colorant on the surface produces a high optical print density, bright tone, a high sharpness, and high wet resistance. The effects of the above-described issues have been reviewed and exemplified in detail (14). 

The coat layer reduces the penetration of ink into the paper sheet Therefore, the ink does not spread as much and the print image is clear and sharp. The print density and the print gloss are enhanced, and the ink demand is reduced compared to uncoated papers. 

This means unwanted variation in density, color or gloss in print. The size and intensity of the variations are measured. Print density variations (graininess 0.5-2 mm mottle 2-8 mm) are measured from an even black and/or cyan tone of at least 40% and as an average of eight images with a size of 51 x 51 mm. ... 

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