Googling around on the internet I found a recipe for making ferric
chloride. I have not tried it, so can’t guarantee it. I found it on a
site frequented by people who make circuit boards.
The recipe is as follows. Into a plastic pail dump some liquid
muriatic acid. Then dump in a generous handful of nails. Be sure they
are not galvanized. They will dissolve in the muriatic acid. When
they are all dissolved, dump in another handfull. Keep dumping until
the nails will no longer get dissolved. What you have now, is ferric
chloride. Bottle and stopper it, and keep in a dark place.
Caution, Wear goggles and long heavy latex or rubber gloves to
protect your hands and arms from any splashing. Although Ferric
Chloride is relatively safe, treat it as you would any potentially