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The HP 731 is a universal printhead, designed by HP to handle two color channels per head.
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It works specifically with HP Bright Office Inks, which helps deliver bright, accurate colors for technical prints
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Built on HP Thermal Inkjet (TIJ 4.0) technology for reliable drop generation.
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The head has 4,224 nozzles total — that’s 2,112 nozzles per color (since it supports 2 colors)
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The drop size is 6 picoliters, which gives a good balance of detail and coverage.




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