| 摘要 |
Color imparting compositions for ink jet printer inks, as well as inks with such color imparting compositions therein, which can be used in a commercially available ink jet printer or the ink jet printer of a postage metering system to print machine readable information based indicia, such as postage, on a substrate, such as an envelope, are disclosed. The color imparting composition includes a water soluble black colorant material adapted to absorb light in a wavelength range between about 400 to 650 nm, such as Reactive Black 31 dye or Direct Black 195 dye, and a water soluble cyan colorant material having a molar extinction coefficient of at least 10,000 at a wavelength maximum in the range of about 580 to 750 nm, such as Direct Blue 307, Direct Blue 199 or Acid Blue 9. The weight ratio of the black colorant material to the cyan colorant material in the color imparting composition is in the range of about 50 to 1 to about 5 to 6. |
