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

----- Original Message -----
From: "Stefan Trethan" <stefan_trethan@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Saturday, May 06, 2006 10:30 PM
Subject: Re: [Homebrew_PCBs] Ferric Chloride - muck at bottom of tank
question


> On Sat, 06 May 2006 23:27:07 +0200, Leon Heller
> <leon.heller@...> wrote:
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>
>>
>>
>> Try adding some HCl, that should get rid of the sludge. Adding H2O2 will
>>
>> also help, with the HCl it will convert cuprous chloride into cupric
>>
>> chloride. Doing that should allow you to use the solution indefinitely,
>> if
>>
>> you wish. Heating to about 50C will speed things up a lot. I always heat
>> my
>>
>> FeCl3 etchant by putting the etchant container inside a larger one
>>
>> containing hot water.
>>
>>
>> Leon
>
>
> Do not heat any etchant containing HCl. HCl boils at very low temperature
> and large amounts of corrosive gas are released even below that.

If a small amount is added, there won't be any fumes when it is heated. I've
never noticed any when I've done this.

Leon

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