Lexmark International, Inc.

Meagan C Winkler

James Harold Powers

Agnes Kam Zimmer

Jack William Morris

Susan Hardin Butler

An ink jet printer includes a carrier for mounting a first printhead and a second printhead. A first ink reservoir is coupled in fluid communication with the first printhead, and contains a chromatic dye-based ink. A second ink reservoir is coupled in fluid communication with the second printhead, and contains a chromatic pigment-based ink.

Ink jet printer that prints using chromatic inks of multiple types

An ink composition comprising: a self-dispersing carbon black, a binder, a stabilizing dye comprising at least as many groups comprising COH or COSH as groups comprising SOH, and an aqueous vehicle. The stabilizing dye can improve the reliability and performance of the ink composition. The addition of the stabilizing dye can reduce or prevent the formation of material that blocks the printhead vias and throats as a result of the presence of a binder in the ink. The ink composition can reduce the amount of maintenance needed to retain all of a printhead's nozzles through the life of the printhead.

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Lexington, KY, United States of America

Meagan C Winkler