Homebrew PCBs

That is the reason I qualified my comment.  Also responded with some links.

John

  ----- 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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