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After you have finished the etching off the copper from the silver,
rinse the metal very well under running water to remove all the
ferric chloride. Be sure to wear gloves when handling chemicals.
Place the cleaned, washed piece of metal in a bath of household
ammonia. I use lemon scented without diluting it at all. I place the
ammonia in a covered plastic container so the fumes will be
contained; it must be deep enough to cover the metal entirely plus
about 1/2 inch. Be sure to wear rubber gloves and not inhale the
fumes. Once this has soaked in this solution for a short while, take
out of the bath, rinse off under running water and scrub with a green
or red scrubby. This should remove the black (carbon deposit from
the ink) and/or the paper from the metal. You can also use a very
fine brass brush to accomplish the removal of the carbon deposit. If
you are still having a problem, you can scrub with barkeeps friend,
a product that is found in the cleaning section of the supermarket.
It is a non-chlorine based mild abrasive. Be sure to rinse well
under running water between each application of chemical and/or
abrasive material so you do not have any adverse chemical reactions.
This should get all the black residue off the metal. Good luck.
Unique Solutions, Inc.
Paste and Powder Solder for Jewelers and Metalsmiths.