Homebrew PCBs

If you leave peroxide (3%) on sun for day or two it's unusable for 
etching. It must be stored in the dark place. In light it's disolve to 
Oxigen and pure water.


Dne 10.7.2012 0:52, pi\ufffde tda7000:
> I had a slow etch problem last time I made a board.
> I think the temperature was rather low (I was doing it on a winter evening) also my chemicals are rather old.
>
> After nothing much doing after 15 minutes or so, I poured boiling water into a dish and set my etching tub on top. Went like crazy after that.
>
>
> --- In Homebrew_PCBs@yahoogroups.com, "leeleduc" <leeleduc@...> wrote:
>> I use this technique all the time. I can do a 2X4 inch, 1 ounce board in about 1.5 to 2 minutes.
>> I use 1 Part 31% HCL and 2 Parts 3% H2O2. I make just enough etchant to cover the
>> board about 1/8 to 1/4 inch and lightly brush the surface with a foam Paint
>> brush. I etch at room temperature. Works very well for me. Make sure your chemicals are fresh, especially the peroxide.
>>
>> --- In Homebrew_PCBs@yahoogroups.com, "txtom2" <unknown2@> wrote:
>>> I just mixed up some Muriatic Acid and Hydrogen Peroxide (1:2) and tried etching a very small piece of PC board (cleaned and with no mask)to see how long it takes to etch thru (room temp about 75 degrees F). I saw a change in surface color in a couple of minutes, but no etch thru after 15 minutes. I changed the ratio to 2:2 to increase the acid content and after 15 minutes, no further apparent progress.
>>>
>>> Can someone please tell me what I'm doing wrong ? About how long should it take to etch ??
>>>
>>> Thanks,  Tom
>>>
>
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