PRINTER INK EXPERT PLEASE

PRINTER INK EXPERT PLEASE....I need to know if the composition / formula of the black  ink used in a HP 6840 printer is the same ink as in the HP Envy 120. I have aftermarket ink that works perfectly in the 6840 but don't know if it will work in the Envy. Additional information: 6840 black cartridge is a HP #96. The black cartridge for the Envy 120 is a #60.
Need-a-ClueRESEARCHERAsked:
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FeMasterConnect With a Mentor Commented:
I'm not an Ink Expert by any means, but I don't think anybody will be able to definitively tell you one way or another if the ink in both printers is exactly the same or not; except HP, and I doubt they will spill the info.  Just a thought on my part, but it would make more economical sense for HP to use the same ink in all their printers, then to stock many different formulas...

Through the research I did, both printers are classified by HP as "HP Thermal Inkjet", meaning they both use the same technology to get the ink from the cartridge to the paper.

The 6840 lists it's ink types as pigment-based and dye-based. Generally it's the black that will be pigment-based, while the colors would be dye-based.
The 120 doesn't indicate the ink types.

If I had to go on an educated guess, I'd say they would be the same.

If you want to do a test, and can still print from both printers (or have a scrap page printed by each), get the paper wet.  The colors will most likely run (because they are dye-based), while the black should not (if it's pigment-based).  If the black does not run on a page from either machine, then they are both pigment-based, and using the ink you have will probably be fine.

This, of course, will only work if the after-market black ink you are using is pigment-based, like the OEM ink is.

You may get a better response from someone else, and I hope you do, but I'm not holding my breath. Good luck.
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Need-a-ClueRESEARCHERAuthor Commented:
MOST EXCELLENT and in depth answer. Thanks so much. I am 90% you are correct.. Oh, and thanks so much for the pigment / dye ink test!! I can't wait to try it.
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