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

----- Original Message -----
From: "Dylan Smith" <dyls@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Saturday, June 28, 2008 4:30 PM
Subject: Re: [Homebrew_PCBs] Ferric Chloride - Alternatives


> On Sat, 28 Jun 2008, Russell Shaw wrote:
>> Well Geez, i've been etching with the same tank of FeCl for 2 years.
>
> I've been using the same batch of FeCl for over a year (and many boards)
> too, it does seem to last well.
>
> Someone told me that salt helps rejuvinate FeCl - not being a chemistry
> geek I have no idea if this is right or not - is this true or is it BS?

I doubt it. HCl and H2O2 works - I think that the H2O2 oxidises the ferrous
chloride and cuprous chloride to ferric and cupric chloride, and the HCl
provides additional Cl ions.

Leon