Adam Seychall's page is back. There is also a PDF backup of it in the Files section under Etchants.
http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/All the information you'll ever need for keeping your CuCl etchant going.
There is more information in that Files folder, including instructions on proportions of drugstore H2O2 with hardware store 30% HCl muriatic acid.
http://tech.groups.yahoo.com/group/Homebrew_PCBs/files/Etchants/Steve Greenfield AE7HD
--- In Homebrew_PCBs@yahoogroups.com, "John Anhalt" <janhalt@...> wrote:
>
> Not quite that simple. You do have to add HCl occasionally to provide chloride ion.
>
> When I switched from ferric chloride, I started with copper (II) chloride and have been using that bath for several years. I use air for regeneration; although, peroxide will work too, but common 3% will dilute the bath. Ozone will also work and is quicker than air, but requires a generator. Common household air fresheners don't produce enough ozone to be very helpful, though.
>
> John
>
> ----- Original Message -----
> From: Dave Sage
> To: Homebrew_PCBs@yahoogroups.com
> Sent: Sunday, November 18, 2012 9:58 AM
> Subject: [Homebrew_PCBs] Re: Kepping Your Etchant Good? Multiple Use? Muriatic Acid / H2O2
>
>
>
> FYI
>
> If you are using the Muriatic Acid /H2O2 formulation correctly you never
> need to add more H2O2. Somewhere along the way the original intent of this
> formulation has been lost here. You all should go back and read the original
> post on making Cupric Chloride. You start with acid and H2O2 and saturate it
> with copper. From there you just have to bubble air into it for an extended
> period of time to turn it into Cupric Chloride and it's ready to go. You are
> defeating the purpose by using the acid H2O2 for one time use. Do your
> etching and then return it to a container for more bubbling in the off time
> to convert it to Cupric Chloride again. Lasts forever. In fact you actually
> gain slightly more volume of etchant after each use. Cupric Chloride is used
> in industry now since it is re-usable "more green - no pun intended - since
> Cupric Chloride is green"
>
> Sage
>
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