White ink pigment is heavier than the pigment of the CMYK colors. Gravity will cause the white pigment to settle at the bottom of ink lines and bottles if the printer is idle for more than a day or two.
The below video demonstrates how to prime the white ink lines in a Freejet printer to flush out separated white ink and fill the white ink lines with opaque white ink to deliver a strong underbase and vivid colors in your prints.
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