[pure-silver] Re: Adding Pot Bromife to PC-TEA
- From: "Gene Johnson" <genej2@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 7 Jan 2005 13:39:55 -0800
I noticed that when I added the KBr to my PC-Prestone.
I really like this developer. Even more now with the restrainer. I just did
a high res scan of a 6x7 neg and I had to magnify the image 18 times to get
to where I could barely detect grain. This on Neopan 400. Tones and
contrast are lovely. I can't ask anything more.
----- Original Message -----
From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, January 07, 2005 1:17 PM
Subject: [pure-silver] Re: Adding Pot Bromife to PC-TEA
> I forgot to mention that the potassium bromide is the hardest of all the
> ingredients to get into solution. I suggest grinding up the crystals in a
> mortar if you have one. It takes a lot of stirring to get all the bromide
to
> dissolve in the hot solution.
>
> -----Original Message-----
> From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx]
> On Behalf Of Gene Johnson
> Sent: Friday, January 07, 2005 4:04 PM
> To: pure-silver@xxxxxxxxxxxxx
> Subject: [pure-silver] Re: Adding Pot Bromife to PC-TEA
>
>
> That's what I was looking for. Thanks. I think I will try this when I
finish my
> current stock, which will likely take a while, unless I get going on my
printing
> and make up a bunch of E-72 with it.
>
> ----- Original Message -----
> From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Friday, January 07, 2005 12:51 PM
> Subject: [pure-silver] Re: Adding Pot Bromife to PC-TEA
>
>
> > I had poor results with Gainer's original formula which I list below
> > for discussion purposes.
> >
> > Pat Gainer's Original PC-TEA Developer
> >
> > TEA ................ 100 ml
> > Ascorbic acid ...... 9 g
> > Phenidone .......... 0.25 g
> >
> > The negatives had an unexceptable level of developer fog and lacked
> contrast
> > even though the density was fine. Attempting to get more contrast
> > caused
> the
> > density to become too high.
> >
> > A few weeks ago Gainer changed the formula in an APUG post by reducing
> > the amount of Phenidone to 0.225 g. This helped a bit with the
> contrast/density
> > problem. Soon after that someone suggested adding 0.25 g of potassium
> bromide
> > to the concentrate. This really cleaned up the negatives and greatly
> improved
> > the contrast/density problem.
> >
> > I still was not completely satisfied and decided to cool the action by
> reducing
> > the amount of TEA and by substituting Dimezone-S for the Phenidone. I
> think the
> > Gainer formula has too much Phenidone in relation to the amount of
> ascorbic
> > acid.
> >
> > The formula that I am testing now is
> >
> > TEA ................ 50 ml
> > Propylene glycol ... 50 ml
> > Ascorbic acid ...... 9.0 g
> > Dimezone-S ......... 0.25 g
> > Potassium bromide .. 0.25 g
> >
> > The fog problem is gone and tonal separation is what one would wish
> > from a
> good
> > developer. Development time was a bit longer 8 minutes instead of
> > 7-1/2.
> I am
> > very happy with results so far but will continue testing with other
> > films.
> >
> > The TEA has some solvent action on silver halide and therefore
> > produces
> finer
> > grain than using some other accelerant such as metaborate.
> >
> > Jerry
> >
> > -----Original Message-----
> > From: pure-silver-bounce@xxxxxxxxxxxxx
> [mailto:pure-silver-bounce@xxxxxxxxxxxxx]
> > On Behalf Of Gene Johnson
> > Sent: Friday, January 07, 2005 2:09 PM
> > To: pure-silver@xxxxxxxxxxxxx
> > Subject: [pure-silver] Re: Adding Pot Bromife to PC-TEA
> >
> >
> > I think what I really wanted to ask is if it reauired a change in
> developing
> > times, and if you've seen any change in characteristics. I'm
> > currently
> still
> > using my PC-Kbr-Prestone stock and adding borax and sodium carbonate
> > to
> make
> > working developer. Like it just fine, wondering if I should try to go
> > to
> the
> > single step concentrate when it's gone :)
> >
> >
> > ----- Original Message -----
> > From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
> > To: <pure-silver@xxxxxxxxxxxxx>
> > Sent: Friday, January 07, 2005 10:50 AM
> > Subject: [pure-silver] Re: Adding Pot Bromife to PC-TEA
> >
> >
> > > I haven't had a chance yet to measure it.
> > >
> > > -----Original Message-----
> > > From: pure-silver-bounce@xxxxxxxxxxxxx
> > [mailto:pure-silver-bounce@xxxxxxxxxxxxx]
> > > On Behalf Of Gene Johnson
> > > Sent: Friday, January 07, 2005 12:53 PM
> > > To: pure-silver@xxxxxxxxxxxxx
> > > Subject: [pure-silver] Re: Adding Pot Bromife to PC-TEA
> > >
> > >
> > > And you're now using 50/50?. How big of a ph change did that cause?
> > >
> > >
> > > ----- Original Message -----
> > > From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
> > > To: <pure-silver@xxxxxxxxxxxxx>
> > > Sent: Friday, January 07, 2005 8:59 AM
> > > Subject: [pure-silver] Re: Adding Pot Bromife to PC-TEA
> > >
> > >
> > > > One of the reasons I started using a mixture of TEA and propylene
> > > > glycol
> > > for the
> > > > developer is that it allows me to control the amount of TEA and
> > > > hence the
> > > pH of
> > > > the working solution and still have a waterless concentrate. One
> > > > can
> > > achieve a
> > > > lower pH than for Gainer's formula by adjusting the ratio of
> > > > glycol to
> > > TEA.
> > > >
> > > > Many years ago there was a product (can't remember the name) to
> > > > stop
> > > prints from
> > > > curling. You soaked the washed prints in a bath made by diluting
> > > > this
> > > stuff and
> > > > then dried them. The product was based on one of the glycols.
> > > >
> > > > There is an OTC treatment for "swimmer's ear" which is 2% acetic
> > > > acid in glycerin. Works great to getting earwax out.
> > > >
> > > > -----Original Message-----
> > > > From: pure-silver-bounce@xxxxxxxxxxxxx
> > > [mailto:pure-silver-bounce@xxxxxxxxxxxxx]
> > > > On Behalf Of John Black
> > > > Sent: Friday, January 07, 2005 11:31 AM
> > > > To: pure-silver@xxxxxxxxxxxxx
> > > > Subject: [pure-silver] Re: Adding Pot Bromife to PC-TEA
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > > I never measured the temperature. I will do that when I make
> > > > > another
> > > > batch
> > > > > (which may be awhile). I think Gainer stated in either his
> > > > > article in PhotoTechniques or in a post on the net that the
> > > > > ascorbic acid would
> > > > eventually
> > > > > go into solution without heating after a few days.
> > > > >
> > > >
> > > > I will try this and see how little heat is necessary for
> > > > solubility of the ascorbic acid. I would prefer one of the more
> > > > fluid glycols over methanol
> > > but
> > > > want to avoid the excess heat. I will let you know about the
> > > > temp.
> > > >
> > > > BTW, since glycerol can be used (although in larger concentration)
> > > > to
> > > prevent
> > > > curling in paper, I wonder if either of the glycols might have a
> > > > good
> > > effect on
> > > > curling of paper of film? On second thought, the washing surely
> > > > removes
> > > it so
> > > > it probably doesn't.
> > > >
> > > > OT, propylene glycol is a great cerumenolytic (dissolves earwax)
> > > > and can
> > > be used
> > > > to good effect in cleaning out obstructed ears. Perhaps a good
> > > > use for
> > > outdated
> > > > HC110?
> > > >
> > > > JB
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> >
>
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