[X4U] Magnetic ink

[aamolsch at shentel.net]

We would like to use our inkjet printers to write checks,
but we have been unable to find ink that will print the
routing numbers that bank processing machines can read --
you know, the stuff along the bottom of the checks specific
to each check. Apparently, the ink used has to be specially
formulated
and contain some kind of magnetic content. Has anyone here
discovered a source for this? Or for laser printers?

TIA

Art