Homebrew PCBs

Hi Randy
I used the usual ratio of 3% H2O2 (2 parts) to 31% HCL (1 part) for the 
initial etch mix. I saved the used etch solutrion in a glass jar and and 
when the jar was full,  I would take about 300 ml of used etch and 7 ml 
of H2O2 27% ... I used the 27% to reactivate the used etch because using 
the 3% stuff would add too much WATER and dilute the etch. ... a 4 
square inch PCB etches in 3 minutes with vigorous agitation.
Jim KI6MZ

On 3/5/2011 10:43 PM, Randy S. wrote:
> Thanks Jim ..
> Glad I'm not the only one. Though I havent tried yet.
> What ratio of that 27% peroxide to hydrochloric acid?
>
> Randy
>
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> ________________________________
> From: Jim<jhutch17@...>
> To: Homebrew_PCBs@yahoogroups.com
> Sent: Sun, March 6, 2011 1:25:15 AM
> Subject: Re: [Homebrew_PCBs] Hydrogen peroxide mixing
>
>
> I buy and use 27% hydrogen peroxide sold at the pool supply store ...
> It seems some people don't like green hair caused by chlorine that most
> people
> put in their pools.  The people that I have questioned about using 27%
> H2O2 in
> their pool say it is better than the chlorine.
> One gallon of  27% H2O2 costs $19
> I save my used etch (it is dark green) and add about 7 milliliters of
> 27% H2O2
> to 300 ml of used etch to etch a board.
> Jim KI6MZ
>
> On 3/5/2011 4:40 PM, Harvey White wrote:
>> On Sat, 5 Mar 2011 15:54:37 -0800 (PST), you wrote:
>>
>> Stuff they sell in beauty shops is designed to be nice to your scalp,
>> so has (most likely) extra ingredients, so you now will have long
>> silky flexible PC boards that shine as if this was your normal PC
>> board color.
>>
>> I just buy the cheap stuff at the drugstore....
>>
>> Harvey
>>
>>
>>> Well heck .. this one is all blow outta the water.
>>> I went to the beauty supply place ..
>>> Theirs is 10, 20 and 30 VOL .. dangit ..
>>> AND .. to top that off it has other ingredients ..
>>> Best I could find was hydrogen peroxide , water , phosphuric acid.
>>> Though thinking back on the older days of REAL Coke Cola ..
>>> I wonder if the phosphuric acid / H2O2 mix by itself would etch ?
>>> OK .. where is that fellow .. that was talking chemistry and molarity.
>>> ok .. found his email .. JROD  .. Hope you pipe in here .. :)
>>>
>>> Cant figure it out myself .. I did try .. need to learn more chemistry .
>>> Dont know if phosphuric acid is above copper on a redox table ..
>>>
>>> Oh well .. on to more studying .. and hope that JROD sees this
>>> and after his laughing .. replies .. lol
>>>
>>> Randy - N2CUA
>>>
>>>
>>>
>>>
>>>
>>>
>>> ________________________________
>>> From: Randy S.<rj3819@...>
>>> To: Homebrew_PCB<homebrew_pcbs@yahoogroups.com>
>>> Sent: Sat, March 5, 2011 4:47:21 PM
>>> Subject: [Homebrew_PCBs] Hydrogen peroxide mixing
>>>
>>>
>>> I checked with the beauty shop in town ..
>>> they have 10 , 20 , 30 % peroxide.
>>>
>>> I can get the 10 .. I have several bottles of 3%.
>>>
>>> Can I mix equal amounts of say, 10% and 3%
>>> and end up with , 6.5% ? after starting those
>>> you tube video lectures on chemistry, I guess
>>> it might not be the case .. though it is the same
>>> chemical in this case.
>>>
>>> Randy - N2CUA
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> [Non-text portions of this message have been removed]
>>>
>>>
>>>
>>> ------------------------------------
>>>
>>> Be sure to visit the group home and check for new Links, Files, and Photos:
>>> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>>>
>>>
>>>
>>
>> ------------------------------------
>>
>> Be sure to visit the group home and check for new Links, Files, and Photos:
>> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>>
>>
>>
>>
>>
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> [Non-text portions of this message have been removed]
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> ------------------------------------
>
> Be sure to visit the group home and check for new Links, Files, and Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
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