One of the most desired (premium) applications in the printing world is print with white ink. Obtain white ink
that looks very white and does not turn yellow is difficult to achieve. White ink contains a pigment that
precipitate easily and that means that the ink has to be constantly recirculating through the printer's ink
tubes to avoid the precipitation.
In some white print modes, the white ink is printed first as an opacity layer, and then the colored ink is printed on top. If the white ink has not dried properly, when you print the color ink, it is diluted with the white ink and some uneven marks appear. This is the reason why white print modes are slow, decreasing the productivity of the printer.
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INC, HP, "DYNAMIC DRYING TO AVOID WHITE INK MARKS", Technical Disclosure Commons, (March 22, 2021)