Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

----- Original Message -----
From: "Anthony Shipman" <als@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Sunday, December 06, 2009 2:54 PM
Subject: [Homebrew_PCBs] Ammonium Persulfate - poisonous?


On Sun, 6 Dec 2009 06:45:22 am designer_craig wrote:
> I am not sure if you mean Ammonium Peroxide or Ammonium Persulfate but I
> had some quantity of the latter sitting around for 15 years and it all
> went
> bad and would not etch anything when I tried to etch a board. Not sure
> what it decomposed to but I suspect it reverted to Ammonium Sulphate.
>
> Craig

BTW how toxic is this stuff (Ammonium Persulfate). The container had no
warnings on it. I have some etchant with dissolved copper in it. Is it
poisonous? What is the best way to dispose of it?