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----- Original Message -----
From: Adam Seychell
To: Homebrew_PCBs@yahoogroups.com
Sent: Thursday, May 10, 2012 2:46 AM
Subject: Re: [Homebrew_PCBs] Re: Long-Term CuCl2 setup
On 10/05/2012 10:44, John Anhalt wrote:
>
> Are there any etchants used by hobbyists that are not acid?
>
> Why not just have an "etchants" folder for everything?
>
> John
>
Copper (II) Ammonia chloride/sulfate etchants are alkaline but really
need a automatic replenishing system to keep them working well. They
also inherently release ammonia so not practical for just the occasional
use. There have been attempts to run the ammonia concentration very low
so it doesn't smell, but solution turns to sludge (copper chloride
precipitation) at the drop of a hat.
Air regenerated acid copper chloride is still my favorite. :)
Its only disadvantage is its etches about 1/2 speed of fresh strong
solution of ferric chloride in the same conditions.
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