On Mar 12, 5:28*pm, "Michael Koblic" wrote:

That is interesting. I could never get FeCl work on stainless steel. Mild
steel, copper, brass, yes. Stainless steel, never. Do you have more details?

I was using KPR photoresist, there was some adhesion difficulty (HNO3
acid
wash before applying the resist?), and it etched rather slowly, but
I was only going through 2 mils. The photoresist mal-adhesion just
put
a few pits into the field, didn't bother my application.