Are you sure you added enough acid ∗before∗ aerating ? How do you know
what the acid concentration was after aerating ?
I find it hard to believe it wouldn't oxidize in that time.
I assume you are looking for the transparent green color to determine if
the bath regeneration was completed.
Adam
Phil wrote:
> I tried to use CuCl over a period of 4 months. I was never able to
> regenerate it using a bubbler - even left it running for a week once.
> I added more acid but no regen. However, adding H2O2 made a huge
> difference. My bubbles were fairly small so I think I was getting O2
> into it. I suspect there is more to it than just pumping oxygen into
> the solution.
>
> --- In Homebrew_PCBs@yahoogroups.com, "stan4312" <stanman@t...> wrote:
>
>>I'm attempting to bootstrap my first batch of CuCl as I type, so
>>this page is fresh off my bookmarks:
>>http://pacificsun.ca/~robert/pcb/cucl.htm Pretty good
>>page on CuCl. Lots of precision chemistry.
>>
>>I thought he also had the following seat-of-the-pants advice: if it
>>hasn't regenerated overnight, add more acid, but glancing back, I
>>see it must have been from somewhere else.
>>
>>Stan
>>
>>--- In Homebrew_PCBs@yahoogroups.com, "johnwhitneyfiat"
>><johnwhitneyfiat@y...> wrote:
>>
>>>I have been off the group for a while and I'm sure this was
>>
>>covered.
>>
>>>In the direction for making etchant from Hydrogen Peroxide and
>>
>>Muratic
>>
>>>Acid, it says that you can regenerate with a bubbler. How long
>>
>>does
>>
>>>this take? I know it will depend on the amount and the area that
>>
>>was
>>
>>>etched, but is there a rule of thumb to make it work. I do have to
>>
>>day
>>
>>>that I make a small bathch and it worked great on a sample board.
>>>
>>>John Whitney
>>>Wis X 1/9
>
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