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

----- Original Message -----
From: "Matthew Mucker" <matthew@...>
To: <homebrew_PCBs@yahoogroups.com>
Sent: Sunday, January 04, 2009 11:15 PM
Subject: [Homebrew_PCBs] Shelf life of HCl/H2O2


>I etched my first board a few weeks back with HCl/H2O2 and was very happy
> with the results.
>
> I saved the etchant, since I'd only etched one small board with it, and
> today tried to etch a second board. I saw no evidence of a chemical
> reaction at all.
>
> Now, I know that H2O2 will spontaneously decompose, but it seems that the
> etchant should last longer than a couple of weeks. Has anyone else had
> issues with storing etchant and using it at a later date? Is there
> anything
> I can do to increase the shelf life of my etchant?

You need to make up fresh etchant each time, it doesn't keep.

Leon