>
>This toner no doubt has a blend of traditional toner elements
>combined with some magnetic metal (I don't know what metal).
Iron, like the black ink in US currency.
>It is also likely this toner would become reactive to the etchant,
>defeating the purpose of the toner as an etch resist.
It would probably be most amusing.
>I also do not believe the MICR characters are raised. Feel along the
>bottom of one of your checks where the MICR printing is. The MICR
>printing consists of the block style numbers.
They aren't raised, that would be a disaster. They are read with a magnetic
head that looks exactly like what you'd find in a 1/4" tape deck. There
are differences, but that gets a bit esoteric.