Power ethcher [Was Etching silver]

What is a “power ethcher”? Using the auto battery that was
discussed perviously? Del

Well, the verdict is in on the etching machine. My FIL said the
best thing to use is a battery charger connected to a battery and
then run into the electrolyte. This will reduce the ripple of the
output and won’t run the battery down. It will also control the
current flow for you. Caution, as always, is the keyword here.

Penny