Homebrew PCBs

----- Original Message ----- 
From: "Wayne Topa" <linuxone@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Monday, January 05, 2009 3:06 AM
Subject: Re: [Homebrew_PCBs] Shelf life of HCl/H2O2


> leon Heller wrote:
>> ----- Original Message ----- 
>> From: "Matthew Mucker" <matthew@...>
>> To: <homebrew_PCBs@yahoogroups.com>
>> Sent: Sunday, January 04, 2009 11:15 PM
>> Subject: [Homebrew_PCBs] Shelf life of HCl/H2O2
>>
>>
>>
>>> I etched my first board a few weeks back with HCl/H2O2 and was very 
>>> happy
>>> with the results.
>>>
>>> I saved the etchant, since I'd only etched one small board with it, and
>>> today tried to etch a second board.  I saw no evidence of a chemical
>>> reaction at all.
>>>
>>> Now, I know that H2O2 will spontaneously decompose, but it seems that 
>>> the
>>> etchant should last longer than a couple of weeks. Has anyone else had
>>> issues with storing etchant and using it at a later date?  Is there
>>> anything
>>> I can do to increase the shelf life of my etchant?
>>>
>>
>> You need to make up fresh etchant each time, it doesn't keep.
>>
>> Leon
>>
>
> Leon
>
>  I found a bunch of Curric Chloride (HCL+H2O2) links on Answers.com
> that say it does keep.
> I even went back in my archived mail and found a message from you, on
> Feb 22 2006, where you
> said  you stored yours in plastic Milk bottles.
>
>  I hope you just forgot because I just got together  come HCL and 30%
> H2O2 to ecth a bunch of small
> boards.  I was sure I had read some time ago that is did store for a
> long time with rejuvination.
>
>
>  Am I mis-remembering, which I seem to be doing a lot lately, or has
> something changed.

I was referring to the cupric chloride. The HCl-H2O2 simply doesn't keep.

Leon