[pure-silver] Re: Silverholes... was Pinholes in Lith

  • From: Nick Zentena <zentena@xxxxxxxxxxxx>
  • To: pure-silver@xxxxxxxxxxxxx
  • Date: Thu, 14 Oct 2004 09:27:30 -0400

On October 14, 2004 09:14 am, John Black wrote:
> > JB, I'm using water stop, not acid stop.
> >
> > I'm using Formulary TF4 diluted 1:3 with distilled water.
> >
> > That surprises me that TF4 might be so weakly alkaline.. that's almost
> > neutral.
>
> I'm not absolutely sure about the pH. I think it's in A&T but I loaned my
> copy to a friend. I just emailed him to look it up. We'll see.


        TF-3 is just sodium metaborate and sodium sulfite.  According to the 20 
mule 
team people a 0.5% solution of Sodium metaborate gives a pH of 10.8 at 20C. 
So the question is how much does the hypo and sulfite change that?

        Nick
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