It's been a while since I bought my 720, but from what I remember...
The 71x series does not have a dual ink cartidge set up.  If you are
printing b/w or greyscale, you use the black ink cartridge.  If you want to
print in color, then you must take out the black cartridge and put in the
color one.

It also uses the color ink cartridge much faster because when working with
the color cartridge, it combines all the colors to produce black.

Jim Meagher
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----- Original Message -----
From: Uzi Paz <[log in to unmask]>

> On 14 Sep 99, at 9:55, Susan Hays <[log in to unmask]> wrote:
>
> > Does anyone know any major differences in HP inkjets 712C and 720C
besides
> > the speed?  There is about $70 difference in the price. The 720C is $70
> > more. Need to purchase a new printer for my office.  I have a 722C at
home
> > which I am very pleased with.  All of my printers here at work are the
600
> > series. Just wondering if the 720C is worth $70 more.
>
> I don't know if I saw it here or in one of the newsgroups, but the claims
> are that the 72* series is a bit more heavy and matter invested and a bit
> more robust than the 71* series. I guess that 712 and 722 are a bit
> faster than the 710 and 720.
>
> The 710 and the 720 have the same speed.
>
> I also think that in parallel the 712 and 722 have the same speed, but
> this is just an extension of a principle - not something that I know
> directly.
>
> Uzi
>
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