Use alcohol. I use it for my fountain pens. Just suspend the cartridge in mid air into the solution*the nozzle head*. A few minutes should dilute the dried ink.

John

--- On Wed, 11/25/09, Tamas Rudnai <tamas.rudnai@gmail.com> wrote:

> From: Tamas Rudnai <tamas.rudnai@gmail.com>
> Subject: [OT] Ink jet cartridges not used for a while
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Date: Wednesday, November 25, 2009, 6:42 PM
> Hi,
> 
> I have a Dell AIO 950 and I did not use that printer for a
> year.
> Yesterday I wanted to print something and realised that the
> black ink
> does not work. I think it could have been dried out? Is
> there any way
> to get it back, or should not bother just buy a new
> cartridge? (but
> then I won't use that again for a year so dunno what to do
> with an
> inkjet if that happens every often...) Any advise?
> 
> Thanks
> Tamas
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> q=%s%s%s%s,s,q,q,a=%s%s%s%s,q,q,q,a,a,q); }",
> q="\"",s,q,q,a="\\",q,q,q,a,a,q); }
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