The original question asked was:

Can anyone post here the formula for Cupric Chloride etch and Ammoniacal 
Etch?  I know that Hydrochloric Acid and Hydrogen Peroxide are used in 
Cupric Chloride etch but I can't find any formula in my personal meager 
library.

Thanks...
[log in to unmask]

Reply:
Look in Coombs, Handbook of Printed Circuits 3 rd edition on page 14.15 at 
paragraph 14.4.3  for the chemical reactions for cupric .  The alkaline 
chemistry is on page 14.10.
Hydrochloric acid and Hydrogen peroxide or sodium hypochlorite are listed as 
means to regenerate the cupric chloride etchant.  Only personnel with proper 
equipment and that definitely includes very good ventilation with a fume 
scrubber on the ventilation sustem, and more importantly a good 
understanding should attempt to do this as the reaction basically involves 
the creation of chlorine gas in the solution and you do not want this nasty 
chemical in your breathing area  Chlorine gas really can kill you, and if it 
does not get you when you breath it can cause chemical pneumonia
 ----------
From: [log in to unmask]
To: [log in to unmask]
Subject: Re: FAB: Formula for Etching
Date: Monday, September 23, 1996 10:10PM

John:

I think you are a little confused, and if you try playing around with HCl 
and
peroxide, you are going to die, along with some of the people near you.

Suggest that you look at the website:

http://www.pcbfab.com

and look up the sections on etching, both innerlayer and outerlayer.

This may assist in understanding what the chemistry of the etchants is all
about.

Your inquiry sounded like you want to make your own, and if so, read
carefully, and be real real careful.  This stuff can kill.

Good luck

Rudy Sedlak
RD Chemical Company
[log in to unmask]
phone 415-962-8004

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