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

----- Original Message -----
From: "Stefan Trethan" <stefan_trethan@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Sunday, May 07, 2006 5:26 PM
Subject: Re: [Homebrew_PCBs] Re: Ferric Chloride - muck at bottom of tank
question


> On Sun, 07 May 2006 18:07:13 +0200, fenrir_co <fenrir@...>
> wrote:
>
>> Be careful with the H2O2, while FeCL3 doesn't cause burns quickly,
>>
>> peroxide at that strength will. Always mix outdoors and add slowly,
>>
>> this creates large amounts of foaming and heat.
>>
>
>
> Sounds like a rather wild procedure ;-)
> Any gas that is released when adding H2O2 is probably something you would
> rather wish to keep in the etchant (like oxygen), so if you get bubbles
> that is not always a good thing. At least that's how it is with CuCl,
> there you do not want to add so much to cause bubbles to form and heating,
> because it is only a waste of chemicals.
>
> I'm not quite sure if i had the choice between nursing FeCl on to last
> forever, and starting with clean, fresh CuCl with no FeCl at all, if i
> would choose to use any FeCl. I don't quite see the advantage, i mean, is
> it actually regenerated or is this only CuCl with some used up FeCl
> swimming around in it and making things dirty and blocking the view?

The ferric chloride gets regenerated, of course. The solution is rather
dark, though.

Leon


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