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

--- On Thu, 7/3/08, Leon <leon355@...> wrote:
From: Leon <leon355@...>
Subject: Re: [SPAM] Re: [Homebrew_PCBs] Ferric Chloride - Alternatives
To: Homebrew_PCBs@yahoogroups.com
Date: Thursday, July 3, 2008, 8:21 AM











----- Original Message -----

From: "YD" <yd_br@yahoo. com>

To: <Homebrew_PCBs@ yahoogroups. com>

Sent: Thursday, July 03, 2008 12:17 PM

Subject: [SPAM] Re: [Homebrew_PCBs] Ferric Chloride - Alternatives



> If you "revigorate" it with a slug of HCl after etching a board or two,

> over time the Fe will oxidise and settle as insoluble FeO. Then just

> decant it. That's how I quite unintentionally converted from FeCl to CuCl.

> Didn't dawn on me until I started looking at the chemistries involved.



Are you sure? I use HCl to remove the sludge that tends to accumulate when

using FeCl3, it doesn't precipitate FeO.


That should be Fe(OH)2, rust. Besides the occasional acidification it needs aeration and some time to settle. At least that's my understanding of it. I stored it in a 2 litre PET bottle with some air space, and over time it turned a nice clear dark green with a brownish sludge at the bottom. After carefully pouring it into another bottle the sludge hasn't returned.

- YD.






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