DIY etching tool electric engraver project for electroplating and stencilling

Check out this old school electric engraver diy project kit.
You can easily—and safely—put electrochemistry
to work “branding” your name
on tools, or decorating aluminum sheets.
The stencil pad consists of a metal plate
(copper, aluminum—even a scrap of tin
can) covered with felt that’s saturated
with a solution of table salt (or with
liquid Sani-Flush).
Over this pad you smooth a section of
an [...]