Stainless steel and regular steel both don’t like chlorides and can
be etched with HCl.
All modern art related etching is dependent on the work of
The first site is by Frederic Kleben the originator of the Edenburgh
etch modification. It is a new site (2008) and is basically a
complete on line book on the state of the art.
This site is Cedric Green’s. He is another current proponent of non
toxic processes. This is another on line book.
And on just the electrochemical processes.