Each ink stick of a set of ink sticks for a phase change ink jet printer has formed on the top of the ink stick a three dimensional visually recognizable symbol. At least a portion of the visually recognizable symbol on each of the ink sticks is different, so that the printer user can distinguish which ink stick is intended for each of the ink feed channels of the ink jet printer.

 
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< Phase change ink formulation containing a combination of a urethane resin, a mixed urethane/urearesin, a mono-amide and a polyethylene wax

< Detecting device abnormality by comparing a current value of current of electric power with a preset detecting current value based on a threshold value received by the device

> Apparatus and methods of calibrating pixel off set and pixel gain using digitial hardware

> Color-balanced TRC correction to compensate for illuminant changes in printer characterization
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