[pure-silver] Re: Borax
- From: <C.Breukel@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Wed, 10 Jul 2013 14:54:07 +0000
Thanks for the feedback, Jean David, and you echo my thoughts: it works clearly
quite well for my friend, so he is dialled in. It's just that if my other
friend starts to use it it would be best to at least start with the same
formula, for the ease of comparing notes.
You do make a very valid point on dessicated not staying dessicated..
Thanks and best,
Cor
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Jean-David Beyer
Sent: woensdag 10 juli 2013 16:30
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Borax
On 07/10/2013 03:10 AM, C.Breukel@xxxxxxx wrote:
> Thanks for the feedback guys, Jean-David: I too found that Wiki link,
> so I too assumed it to be decahydrate.
>
>
>
> The reason for asking is that I am weighting out some chemistry for a
> friend to mix FX-37. He was inspired by another friend who uses it all
> the time. Much to my surprise when I could finally get in touch with
> the "source" (he was on holiday) he replied that the Borax he uses :
> de borax is CAS: 1330-43-4. M=201,22g/mol
>
> **
>
> So that's the anhydrous form, and there is almost a factor 2 weight
> difference (381.38/201.22 * 2.5 gram = 4.7 gram Borax per litre) so
> if you guys are right and it should be de decahydrate form, my friend
> is using almost twice as much Borax as intended in the original formula.
>
>
>
> How harmful is that, i.e. will it make the FX-37 faster or more
> contrasty developer ?
>
First of all, not that I am not a photo-chemist.
I remember reading about the various formulae for black and white photographic
developers where I believe it was Kenneth Mees who said that with the plethora
of chemical formulae available that there were an extremely large number of
ways by which identical results may be obtained.
So I would not worry much about it. Your friend will have to calibrate the
developer anyway to suit the film, light meter, shutter(s), aperture settings,
enlarger characteristics (if enlarging), etc., etc.
So while I expect that using dessicated borax (if it stays dessicated until you
weigh it out) would get you a slightly more contrasty developer, that your
friend, after calibrating it, would just use a slightly shorter development
time to get the contrast he wants.
If the dessicated borax was kept around long enough here in New Jersey, the
stuff would become partially hydrated from the high relative humidity we have.
Here in USA, it is probably difficult to get borax in other than the
decahydrated form.
I think the FX formulae are American, right? If so, I assume the decahydrate is
meant. If it is English, they may mean dessicated.
When all is said and done, more is said than done. Mix it up with whatever form
of borax you have. Then calibrate it. I used to play around with developers a
lot. Now I use mostly Xtol developer 1+1. When I cannot get that anymore, I
will go back to mixing D-76-d.
>
>
> FYI FX-37:
>
>
>
> Sodium sulfite, 60.0 g
>
> Hydroquinone, 5.0 g
>
> Sodium carbonate, anhydrous, 5.0 g
>
> Phenidone, 0.5 g
>
> Borax, 2.5 g
>
> Potassium bromide, 0.5 g
>
> Benzotriazole, 1% solution, 5.0 ml
>
>
--
.~. Jean-David Beyer Registered Linux User 85642.
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