On Sun, 10 Apr 2011 19:40:39 -0000, you wrote:
>ok .. thanks Harvey ..
>Does it also change color when it calms down?
>When I added more 3% peroxide .. it changed color..
>and slowed down the etching process immensely.
>Didnt seem like I added all that much either..
As I remember, it started clear, then turned light and transparent
green. As the etchant changes, it goes to an olive color/dark green.
The 17% peroxide was more than needed, it is usually mixed in that
ratio using 3%.
You diluted it a bit, and that probably needed to be done.
Adding more peroxide later will tend to turn it transparent green. As
it ages, it does need oxygen to make the reaction run, that's the
function of the peroxide.
Harvey
>
>
>--- In Homebrew_PCBs@yahoogroups.com, Harvey White <madyn@...> wrote:
>>
>> On Sun, 10 Apr 2011 10:57:23 -0700 (PDT), you wrote:
>>
>> >ok .. 17% peroxide ..
>> >34 % muriatic acid ..
>> >mixed 3 : 1 ..
>> >never seen copper come off a board that fast .. ever ..
>> >did it outdoors .. respirator .. goggles .. gloves ..
>> >anyways.. should the solution be bubbling even AFTER I take the
>> >board out ?? whats it mean .. I put more 3 % peroxide in it ..
>> >calmed it down .. is it safe?
>>
>> The peroxide is going to decompose and release oxygen, that's what you
>> see. It will calm down in about 30 days to the point where it doesn't
>> want to do much.
>>
>> Regenerate it by bubbling oxygen through it. It eventually changes to
>> a different kind of etchant, takes longer, is a bit more mild in
>> terms of action.
>>
>> Nothing to worry about in the proportions you used.
>>
>> Harvey
>>
>> >
>> >Randy
>> >
>> >
>> >
>> >------------------------------------
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>> >
>> >
>>
>
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>------------------------------------
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>Be sure to visit the group home and check for new Links, Files, and Photos:
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