[pure-silver] Re: Adding Pot Bromife to PC-TEA
- From: "Gene Johnson" <genej2@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 7 Jan 2005 13:04:25 -0800
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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