Hello Kevin, do you have also any information about photoresists which could be used to mask stainless steel ? Do you have any information about the etch rate ? Many thanks, Andrea > Novak, > > According to CRC's Handbook of Metal Etchants (pg. 198), an aqueous Ferric > Chloride solution may work. To quote: "Solution used as a general etch for > metals to include irons, steel, and nickel." The concentration is > annoyingly > given in terms of density (30-35 Baume). Temperature is "RT to hot." > > I know you can get this stuff cheaply in most PCB etching kits, so no > problem there. As for what it will do to magnesium diboride though... no > idea. > > If that turns out to be problematic, perhaps try an electrochemical etch > instead?