This works very well for both copper, brass, bronze and silver. Use
ferric nitrate for the silver, a 3 to 1 dilution (water to ferric
nitrate). Use distilled water.
Tip! Clean the acetate and metal with dilute isopropyl and make sure
the metal is still wet with alcohol when you lay down the acetate.
Trust me, this works. Also, some acetates work better than others. I
use 3M PPM 2500. This is the most reliable of all of them.
If you want the entire protocol, email me offline and I will be glad
to send it to you. I just finished making a bird house with
photoetched migration maps. The etching is tight and clean.
A studiomate of mine is etching Celtic patterns in silver using my
method and PnP Blue (although I find the PnP blue very fussy).
M E T A L W E R X
10 Walnut St.
Woburn, MA 01801