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HP Color Inkjet cp1160 Series Printer - Underprinting

Introduction
The underprinting process places a small amount of color ink under the black ink. The color ink interacts chemically with the black ink to cause the pigment to fall out of solution almost instantaneously. When the black drop falls on top of a color drop, the pigment is deposited quickly on the surface of the paper where the black drop landed and does not soak into the paper. The remaining carrier solution soaks into the paper as it normally would. The net result is that the black pigment is deposited more quickly on the surface of all papers giving great black text and image quality on a wide range of paper types. This process also gives better black dry time and less smudge from freshly printed black text or images (the carrier solution may not have completely dried, but it no longer contains pigment, so there is no perceptible smudge). Another advantage is that the black pigment forms a smaller dot (spreads out less) with underprinting.
    Figure : Black printing without underprinting
  1. Paper
  2. Pigmented black drop
  3. Time
  4. Pigment deposited on surface of paper
  5. Some pigment soaked into the paper
    Figure : Black printing with underprinting
  1. Paper
  2. Dye-based color drop
  3. Pigmented black drop
  4. Time
  5. Pigment falls out of solution
  6. Pigment deposited on surface of the paper with less spreading
  7. Almost no pigment soaked into the paper
Summary of benefits of black underprinting (K Fortification):
  • Improved black print quality (better opacity and edge definition)
  • Greater media independence (great print quality on a wide range of plain paper types)
  • Faster black dry time
  • Reduced smudge and smear of black printing

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