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Photo Forum / Film Photography / Darkroom / February 2004sodium metaborate
http://www.colba.net/~fotochem/index.htm for sodium metaborate > http://www.colba.net/~fotochem/index.htm for sodium metaborate 69 grams of 20 Mule Team borax +14.5 grams of Red Devil lye in a liter of solution is close enough to a 10% solution of Kodalk for government work. Kodalk is sodiun metaborate tetrahydrate. The reason the ingredients do not add to 100 grams is the 4 molecules of water that are present in Kodalk but not in the borax-lye combination, among other things. >> http://www.colba.net/~fotochem/index.htm for sodium metaborate > 69 grams of 20 Mule Team borax +14.5 grams of Red Devil lye in a liter [quoted text clipped - 3 lines] > present in Kodalk but not in the borax-lye combination, among other > things. I don't remember what I paid for borax the last time but I don't think it was much cheaper then buying metaborate in the 5lb bag. Nick >... > I don't remember what I paid for borax the last time but I don't think it >was much cheaper then buying metaborate in the 5lb bag. > > Nick feb2004 from Lloyd Erlick, Correct me if I'm wrong (haven't used Kodalk in some time) but I think the problem with having large amounts of it around is that it cakes in storage unless carefully handled. Five pounds might be hard to keep in useable condition. regards, --le ________________________________ Lloyd Erlick Portraits, 2219 Gerrard Street East, unit #1, Toronto M4E 2C8 Canada. --- voice 416-686-0326 lloyd AT the-wire DOT com http://www.heylloyd.com ________________________________ >>... >> I don't remember what I paid for borax the last time but I don't think it [quoted text clipped - 9 lines] > storage unless carefully handled. Five pounds > might be hard to keep in useable condition. I don't remember what shape mine is in. I only use it for TF-2 fixer and that's a massive 10 grams per litre. Wouldn't a mortar be enough to fix things? Nick >> ... I don't remember what I paid for borax the last time but I >> don't think it was much cheaper then buying metaborate in the 5lb [quoted text clipped - 8 lines] > cakes in storage unless carefully handled. Five pounds might be hard > to keep in useable condition. Perhaps it depends on how you store it. I keep it in either glass jars, or in metal "paint-cans" and never have problems storing it. I am always bemused by people wanting to make up sodium metaborate from borax and sodium hydroxide, making stop bath from vinager, and so on. Perhaps this may be necessary in some out of the way outposts, but in most countries of the civilized world (i.e., wherever fine chemicals are sold), you should be able to get what you need except for very rare things, and these things are not rare.  Signature.~. Jean-David Beyer Registered Linux User 85642. /V\ Registered Machine 73926. /( )\ Shrewsbury, New Jersey http://counter.li.org ^^-^^ 3:45pm up 45 days, 3:07, 2 users, load average: 2.19, 2.16, 2.13 > I am always bemused by people wanting to make up sodium metaborate ... > stop bath from vinegar, and so on ... in most countries of the > civilized world ... you should be able to get what you need It just doesn't take much to bemuse some folks. Maybe in Civilized Shrewsbury they have a Midnight Chemical Supply, but here in Decadent Cleveland I use the local grocery store -- for Calgon, borax, carbonate, ascorbic acid, acetic acid, sodium sulfite, blah-blah-blah -- and when I need something at odd hours, they are always open. Another reason: I already have a cupboard full of chemicals. Why stuff it full of more chemicals (that can't be used for anything else [is metaborate a base stock for anything?] and will probably solidify, leak or go off before I finish the jar) when I can do it myself if 2 minutes? I am in favor of stocking just the basics. SignatureNicholas O. Lindan, Cleveland, Ohio nolindan@ix.netcom.com Consulting Engineer: Electronics; Informatics; Photonics. >>I am always bemused by people wanting to make up sodium metaborate ... >>stop bath from vinegar, and so on ... in most countries of the [quoted text clipped - 7 lines] > sulfite, blah-blah-blah -- and when I need something at odd hours, > they are always open. Oh, no. We do not have a suitable chemical supply house at all. The nearest is Fishkin Brothers in Perth Amboy, about 1/2 hour north of here by train or automobile. And they are open only during business hours. > Another reason: I already have a cupboard full of chemicals. Why > stuff it full of more chemicals (that can't be used for anything > else [is metaborate a base stock for anything?] F6 fixing bath, some developers, pre-toning bath. > and will probably > solidify, leak or go off before I finish the jar) when I can do it > myself if 2 minutes? > > I am in favor of stocking just the basics. I agree. We may differ in just what the basics might be. For me, they include Metol, Hydroquinone, Amidol (I could do without it) Sodium Sulfite, Sodium Sulfate, Sodium metabisulphite Borax (I could do without it), Sodium Metaborate, Citric acid (I could do without it), Acetic acid Sodium Thiosulphate (pentahydrated) Benzotriazole, Potassium Bromide (I could do without it) Potassium Alum PhotoFlow, KRST I have 5 pound bottles of most of those on a single 6' shelf. The rest of them (the developing agents, the KBr, Sodium metabisulphite, benzotriazole) are in smaller bottles. A special case is sodium thiosulphate: I get a 100 pound drum of that stuff at a time. I know when I am likely to run out, so I can get the next supply during normal business hours. Signature.~. Jean-David Beyer Registered Linux User 85642. /V\ Registered Machine 73926. /( )\ Shrewsbury, New Jersey http://counter.li.org ^^-^^ 4:45pm up 45 days, 4:07, 2 users, load average: 2.24, 2.21, 2.12 In the city I live there are many chemists. The store I use the most sells sulfite, hydroquinone, phenidone, carbonate, hypo, propylene glycol, acetic acid, a lot of things. But no metol or metaborate in any store. They say there's no demand for them in retail, and when the phenidone stock is over, it'll be gone. Jorge > I am always bemused by people wanting to make up sodium metaborate > from borax and sodium hydroxide, making stop bath from vinager, and so > on. Perhaps this may be necessary in some out of the way outposts, but > in most countries of the civilized world (i.e., wherever fine > chemicals are sold), you should be able to get what you need except > for very rare things, and these things are not rare. ...and for a chemically ignorant acolyte, how much of this 10% solution is needed to add the equivalent of 1 gram of Kodalk to a solution? BTW, congrats on the Photo Techniques article. Neat. -Lew Hi Lew, Once you have a 10% solution of anything, then for every liter you have 100 grams of the chemical, in this case, Kodalk. To get 1 gram of Kodalk out of it, use 10 ml. of solution. Francis A. Miniter >...and for a chemically ignorant acolyte, how much of this 10% solution is >needed to add the equivalent of 1 gram of Kodalk to a solution? BTW, >congrats on the Photo Techniques article. Neat. >-Lew |
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