Ferric chloride is a traditional home-use circuit board etchant. It's easy enough to come by, and the Ferric by itself...
www.instructables.com/id/Stop-using-Ferric-Chloride-etch<br/>ant!--A-better-etc/
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www.instructables.com/id/Two-sided-PCB-using-toner-metho<br/>d/
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