--- In
Homebrew_PCBs@yahoogroups.com, "Andrew" <andrewm1973@...>
wrote:
>
> > Bill wrote:
> > Might just prove a little tricky here in rural
> > Tassie andrew but thanks for the tip. I'll
> > give it a try.
>
> No hydroponics stores in Tassie ? Do they just
> grow their smoking tomatos out in the open down
> there :P
>
> Don't worry - I wont make any Tasmanian jokes.
> Here in Brissy we normally are too busy making
> Ipswich jokes.
>
> You can get buy without H202 for the CuCl
> etchant. It just makes it a lot easier to
> start it up.
>
> >What strength was the hydroponics store stuff?
>
> It was that stuff they call "40%" which is some
> measure of volume gas or something. It's realy
> 27% or something similar from what other posters
> have said.
>
Here in the states I get '40 Volume' to regenerate FeCl3, which is 12%
I believe (About 3% per 10 Volume, which has to do with how much
oxygen it gives off, the conversion is irritating) in hairdressers
supply stores (Sally Beauty Supply for those who need it in the US).
It's used as hair bleach.
Other stores don't usually carry anything over 20 Volume.
Peroxide over 3% (standard drugstore strength) is dangerous. Handle
with care.