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

----- Original Message -----
From: "microsoftwarecontrol" <microsoftwarecontrol@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Thursday, July 14, 2005 12:55 AM
Subject: [Homebrew_PCBs] saving FeCl3 solution


>I bought solid FeCl3, in small ball shape.
> I add water to get pcb etching solution.
>
> I found used FeCl3 solution will become
> two parts: green, transparent liquid and
> yellow solid at bottom.
>
> As I understand, green solution should
> contain Cu ion from pcb.
>
> Could I pour out green liquid and add new
> tap water to renew etching liquid?

No, that will just dilute it. Adding HCl and H2O2 is the way to do it, it
gets rid of the sludge and converts the cuprous chloride to cupric chloride,
which is quite a good etchant in its own right.

Leon



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