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> Sodium bi sulfite |
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Sodium bi sulfite
hi
Im looking to mix some LC1 low contrast developer for use with lith film http://farahmahbub.com/VirtualMatter/formulasGalore.htm the formula calls for 10g of Sodium bi sulfite but silverprint don't have this anybody got any ideas thanks robin |
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Quote:
I assume that home brewing is a popular pastime in your country, as it is in mine! |
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Stocky is correct in that you can substitute Sodium Bisulfite weight for weight with Sodium Metabisulfite. You will find it listed at Silverprint's, but it is spelt with a PH, Sodium Metabisulphite.
Stoo |
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What follows is from http://silvergrain.org/Photo-Tech/ch...misnomers.html, a link that I came across on the unblinkingeye.com web site. The article linked to disappeared a couple of years ago but can still be found on the wayback internet archive. It takes a bit of digging to find.
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Sodium Metabisulphite is available from any home wine/beer shop as it is used for sterilisation of equipment and to stop wine fermentation when required.
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#7
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Robin, as Stoo and Paulc have already pointed out Sodium bisulfite is the same as sodium metabisulphite (correct English spelling).
I get mine from Silverprint as it's also used in solution A in the PMK pyro formula.
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#8
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Sodium Bisulphite is not the same as Sodium Metabisulpite they have slighly differing anti-oxidant properties. J.T.Baker sell both for Industrial use and where a stronger preservative or sterilising effect is needed - typically in the food & wine industry - Metabisulphite is used.
The problems is that commercial Sodium Bisulphite is a mixture of Sodium Metabisulphite and Sodium Bisulphite and it's variable. You can substitute Metabisulphite for Bisulphite with no ill efects but the other way around may not be give enough anti-oxidant effect. In Europe these chemicals are manufactured differently to the US and we can get good Sodium Metabisulpite whereas in the US Sodium Bisulphite is more common. This is similar to Sodium Carbonate (Anhyd) being the common form here and Sodium Carbonate (monohyrate) in the US. Ian Last edited by Lostlabours; 23rd April 2012 at 11:10 AM. |
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thanks for all the information
Sodium Metabisulphite it is robin |
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potassium ?
Hello Chaps
Could I lob in an extra question here - topical - as I've been trying to source some sodium metabisulphite , had some sent by Rose Chemicals today, and he's subbed Potassium Metabisulphite . Does anyone know if this is a direct alternative, before I mix up some PMK at the weekend ? |
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