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Look for clear hair bleach. I think it's around 12% (40 deg. Baume?);
strong enough to burn your bare hands.
I understand janatorial supply shops have it even stronger, but it
starts to get dangerous and these days may find the police checking
you out.
I got mine from the local Sally Beauty Supply.
In this part of the US they seem to show up
near WalMarts.
On Fri, 6 Apr 2018 21:45:00 -0700, you wrote:
>Copper clad board using muriatic acid would like to find better than 3%
>hydrogen peroxide if possible. In the usa LA california to be exact.
>Also what are some of the better methods of making a pcb cheaply
>BTW if needed I have 99 uv led on a circuit board built that a while ago
>just would need a cheap uv kinda etch resist suggestions welcome there.
>terramir
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