Your question isn't quite complete, so it is somewhat difficult to answer..
Do you wish to dissolve or dilute ink for use within an inkjet printer,
or to try to unclog an inkjet head, or just to dilute the ink for other use?
The reason I ask is that some solvents for the ink may be fine to do
that as long as the solvent isn't going to be used within a
printer/cartridge. However, some solvents will react with the mixtures
of plastics and metals used within the printer, or the papers you may
print upon.
If you are seeking a safe solvent for use within the printer, that is
more limiting. Some solvents may not be compatible with some inks, even
dye inks, so testing is always best before considering using them in the
printer.
However, even if the solvent does a great job on the ink, it may still
react with the plastics or metals.
For most printer parts, isopropyl alcohol and a mild ammonia solution (1
to 2% by volume) work safely at both dissolving dried ink and not
harming the printer parts. Other alcohols may damage plastics, some
solvents are corrosive and may literally start to dissolve the head
components.
Solvents like Fast Orange may contain orange oil which is very
destructive to some (especially styrene) based plastics.
Heavy duty grease cutting solvents are not likely to be appropriate due
to the plastic damage they can cause. Also, keep in mind that some
solvents may not appear to damage anything, but the solvent will slowly
weaken or damage the plastics and the part may fail weeks or months later..
Keep I'm mind that many dye ink printers use a pigment black ink for text..
Lastly, it appears that some countries make it very difficult to acquire
ammonia, so other substitutes might be required.
Art
If you are interested in issues surrounding e-waste,
I invite you to enter the discussion at my blog:
http://e-trashtalk.spaces.live.com/
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