Copper Chloride Etchant
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Copper chloride is a 100% reusable for life etchant - which is regenerated as needed so you don't have to throw out the toxic etchant -
https://www.instructables.com/id/Stop-using-Ferric-Chloride-etchant!--A-better-etc/
Links
- Proper etching procedure using Copper Chloride solution. Technical reqiurements - [1]
- Reliable, but getting a fine-tuned solution appears to need a lot of practice