On copper - Staz-on will work. So will any regular rubber stamp ink covered with embossing powder. I don't like to use embossing powder though, it's hard to tell how deep the etch is when the embossing powder is raised.
On silver - Staz-on will kind of work for a shallow etch. It's not a strong enough resist if it's left in ferric nitrate for more than 1/2 hour. I use PnP 99.9% of the time with silver as I know it will hold up and I'll get a good etch with it.
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Susan
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