[pure-silver] Re: Silverholes... was Pinholes in Lith
- From: "John Black" <jblack@xxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 14 Oct 2004 09:42:36 -0400
>
> 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?
Na metaborate (Kodalk) and Na sulfite in a ratio of 4:1 by weight gives a pH
of about 10.00. I would not want to use a fixer, or any post develop
traetment at this pH. NH4 thiosulfate works just fine at just above
neutrality.
JB
>
> Nick
>
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