Homebrew PCBs

----- Original Message ----- 
From: "Phil" <phil1960us@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Thursday, February 26, 2004 3:47 PM
Subject: [Homebrew_PCBs] shelf life of ammonium persulphate


> I've read the archives and googled.  I saw several references to
> shelf life as a negative of AP.  Does anyone know what the shelf life
> is? I am assuming that the powder/crystals is indefinite but the
> solution is not.  I know AP is not the prefered etchant around here
> but have some and will probably use it.

I used it a long time ago and it didn't keep for more than a couple of days.
I used to mix it fresh each time I did any etching; the boards were quite
small.

Leon
--
Leon Heller, G1HSM
Email: aqzf13@...
My low-cost Philips LPC210x ARM development system:
http://www.geocities.com/leon_heller/lpc2104.html