Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "Leon" <leon355@...> wrote:
>
> ----- Original Message ----- 
> From: "Howard" <hj.payne@...>
> To: <Homebrew_PCBs@yahoogroups.com>
> Sent: Wednesday, June 04, 2008 3:53 PM
> Subject: [Homebrew_PCBs] HELP: Ammonium persulfate
> 
> 
> > Hi all
> > X-Antispam: NO; Spamcatcher 5.0.12. Score 2
> >
> > Now i have been out of making Projects and PCB'S for some yrs now
> > and have just got back into doing it, god what have i missed ?.
> >
> > I need to make about 3 ltrs of this to use in my PA104 etch tank.
> > Now my dad used to use this stuff ages ago (15yrs), but sadley
> > he's no longer with us!. I think as i can remember he used to put
> > a bit of salt in his mix, to give it a bit of a kick!!.
> >
> > Anyway what i am wanting to know is, how meny grams of Ammonium
> > persulfate do i mix to 3 ltrs of water, to etch Fotoboard 2 pcb ?
> >
> > Also is caustic soda ok to use as a developer for Fotoboard 2 ?
> > and to make 1 ltr how meny grams to mix with water ?.
> 
> I used ammonium persulphate may years ago, but I've forgotten the 
> concentration. I used to add some salt to speed it up. I think 
that mercuric 
> chloride was recommended as a catalyst, but it's very toxic.
> 
> 12 g /litre of NaOH is what I use for developing Fotoboard 2 (it's 
about two 
> teaspoons).
> 
> Leon
> --
> Leon Heller
> Amateur radio call-sign  G1HSM
> Yaesu FT-817ND transceiver
> Suzuki SV1000S motorcycle
> leon355@...
> http://www.geocities.com/leon_heller
>

Hi
Please forgiv me but what is NaOH ?
Howard
G7LQY