I've been using Ferric Chloride for years now and it serves my purposes
well. If you look at the method I use at
http://www.picnpoke.com/projects/pcb.html, you will find that the
solution lasts a long time with excellent results. I've been using the
same batch for years. I don't know if it's recylable, but all I know is,
when it turns green, it's dead.

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Best regards

Tony

http://www.picnpoke.com
Email sales@picnpoke.com