Ferric chloride is a traditional home-use circuit board etchant. Its easy enough to come by, and the Ferric by itself is no big environmental problem. However, once youve etched a board with it, youre left with a solution with a bunch of copper chloride in it. This dissolved copper is an environmental problem, and you cant just pour it down the drain (legally) — youre supposed to take it to a hazardous waste facility. (For instance: How to Dispose of Ferric Chloride in this FAQ. )Wouldnt it be nice if there were an etchant that you could re-use indefinitely so that you dont have to worry about disposing of the copper, and that could be made in lifetime supply for like $10.00 with ingredients bought at hardware and drugstores? (And its prettier too.)I got seven words for you: Copper Chloride in Aqueous Hydrochloric Acid Solution! (Exclamation point!)But howre you going …

Ferric chloride is a traditional home-use circuit board etchant. Its easy enough to come by, and the Ferric by itself is no big environmental problem. However, once youve etched a board with it, youre left with a solution with a bunch of copper chloride in it. This dissolved copper is an environmental problem, and you cant just pour it down the drain (legally) -- youre supposed to take it to a hazardous waste facility. (For instance: How to Dispose of Ferric Chloride in this FAQ. )Wouldnt it be nice if there were an etchant that you could re-use indefinitely so that you dont have to worry about disposing of the copper, and that could be made in lifetime supply for like $10.00 with ingredients bought at hardware and drugstores? (And its prettier too.)I got seven words for you: Copper Chloride in Aqueous Hydrochloric Acid Solution! (Exclamation point!)But howre you going ...


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