[pure-silver] Re: Sodium bisulfite
- From: "John Black" <jblack@xxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 14 Mar 2005 16:35:29 -0500
>
> > I need 8 grams of sodium bisulfite for 4 liters of water. How much is
> > that in terms of 37% bisulfite lye?
>
> I think the cheapest and just as good way is to use 8 g of sodium
> metabisulfite in place of sodium bisulfite.
>
Use 21-22ml of the 37% concentrate per 4L water. That will give you 8 gm.
To be precise, use 21.62 ml of the bisulfite lye. It has 0.37gm bisulfite
per ml.
Saturated solutions are good ways to keep easily oxidized solutions. I use a
saturated solution of Na sulfite (about 28%) to add to various developers,
washes and fixes when I need them so I don't have to weigh out the dry
stuff.
JB
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