[pure-silver] Re: SPAM DETECTED: Re: Viradon vs KBT
- From: John Meyers <jmeyers102@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sat, 6 Nov 2004 06:59:36 -0800 (PST)
--- Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
>
> ----- Original Message -----
> From: "DarkroomMagic" <info@xxxxxxxxxxxxxxxx>
> To: "PureSilverNew" <pure-silver@xxxxxxxxxxxxx>
> Sent: Friday, November 05, 2004 3:50 PM
> Subject: [pure-silver] Re: SPAM DETECTED: Re:
> Viradon vs KBT
>
>
> > Richard
> >
> > How do you get to KHCA being 10% sodium sulfite?
> 'The
> > Darkroom Cookbook'
> > calls for 200 grams of sodium sulfite per liter in
> formula
> > 137. Does that
> > not mean 20%?
> >
> >
> >
> >
> >
> > Regards
> >
> >
> >
> > Ralph W. Lambrecht
> >
> Their formula is wrong. I have no idea where they
> got it.
> The paper from Kodak Labs describes the working
> solution as
> 2% sulfite. The formula I have for KHCA is:
>
> Sodium Sulfite, dessicated 100 grams
> Sodium bisulfite 25 grams
> EDTA tetra-sodium salt 5 grams
> Sodium Citrate 5 grams
> Water to make 1 liter
>
> This is also in line with the MSDS
> Also note that 200 grams/liter is close to the
> saturation
> limit for Sodium sulfite.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
Regarding the formula in The Darkroom Cookbook, it
says that the solution should be diluted 1:9 for use.
I give the formula for this stock solution from
Anchell's book below. (Formula #190 in the 2nd
edition):
Water (125 degrees F) 750 ml
Sodium Sulfite 200 grams
Sodium bisulfite 50 grams
Water to make 1 liter
So by diluting this 1:9, one would end up with the 2%
solution mentioned in Richard's post.
John Meyers
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