Question : What do those numbers like 23 and 45 mean on those inkjet cartridges?
Does that mean how many pages you can print? or what? the Tricolor HP thing says 23 and Black is 45.

Sorry I totally need a book that says ‘Printing Cartridges for Dummies’ xD lol jk =P
inkjet cartridges

Best answer:

Answer by  
   They don’t mean anything, they are just the numbers used to identify the specific cartridges, kind of like a model number.