Archive of the former Yahoo!Groups mailing list: Homebrew PCBs
Subject: shelf life of ammonium persulphate
From: "Phil" <phil1960us@...>
Date: 2004-02-26
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.
Phil