Thanks! Can't read the links but i think that ferric chloride is the same than iron perchloride.It must be tried.
I've not a great experience in etching but my daughter use it on brass jewels. On the other hand i use electrolysis to gilded and silvering antiques. I'm a bronze and silver restorer .
I've used bitumen of Judea diluted in turpentine to recreate some Art Deco etching on lightings copies. My daughter use also this technic for etching.
RE: Galvanic etching - Quick HowTo
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Galvanic etching - Quick HowTo
What an interesting job you have! Sorry for the links, I corrected them. Here is one site that describes etching with ferric chloride and sodium persulfate (one method, with different acids): http://thomaspfeifer.net/platinen_aetzen.htm (it’s in german, copy and paste the address in google translate maybe 🤓)
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Thanks a lot floshmo
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