[pure-silver] Re: Old Paper Developer Question
- From: <C.Breukel@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 19 Feb 2008 14:35:15 +0100
Yep,
Richard already answered it, I am surprised he did not mention it's also know
as rubbing alchol I believe, at least over there from my side of the
ocean..;-).. I believe pure alcohol will also do the trick. It is convenient to
have a more stronger stock so when you re-use a developer a lot ( I use DS-14
in a Nova tank and replenish, this combo is realy keeps the developer running
for weeks and weeks). So when you switch to a paper with a slight fog you add
some benzotriazole stock. It does not seem to affect other papers without fog,
but I mostly print on cooler tone papers anyway.
The BZT gets used up though so you have to add a bit extra after a while.
Cor
> -----Original Message-----
> From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-
> bounce@xxxxxxxxxxxxx] On Behalf Of Bogdan Karasek
> Sent: dinsdag 19 februari 2008 14:16
> To: pure-silver@xxxxxxxxxxxxx
> Subject: [pure-silver] Re: Old Paper Developer Question
>
> Hi,
>
> I take it that the isopropanol refers to isopropanol alcohol????
>
> Bogdan
>
> C.Breukel@xxxxxxx wrote:
> > Hi Bogdan,
> >
> > Make a stock of 1% benzatriazole in isopropanol and start with adding 5-
> 10 ml per liter developer.
> >
> > Best,
> >
> > Cor
> >
> >
> >>-----Original Message-----
> >>From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-
> >>bounce@xxxxxxxxxxxxx] On Behalf Of Bogdan Karasek
> >>Sent: dinsdag 19 februari 2008 2:27
> >>To: pure-silver@xxxxxxxxxxxxx
> >>Subject: [pure-silver] Re: Old Paper Developer Question
> >>
> >>Hi,
> >>
> >>Off hand, how much Benzotriazole should be added to Dektol to prevent
> >>fogging. Several months ago, I was given some old printing paper by my
> >>neighbor prior to his return to Switzerland. He had kept it in a dry
> >>place for at least 20 years.
> >>
> >>What would be a good ballpark figure for adding Benzotriazole to Dektol,
> >>in order to get me started and I can experiment from there.
> >>
> >>How many grams per litre of 1:2 Dektol?
> >>
> >>Cheers,
> >>Bogdan
> >>
> >>Richard Knoppow wrote:
> >>
> >>
> >>>----- Original Message ----- From: "Don Sweet" <don@xxxxxxxxxxxxxxxx>
> >>>To: <pure-silver@xxxxxxxxxxxxx>
> >>>Sent: Sunday, February 17, 2008 9:13 PM
> >>>Subject: [pure-silver] Old Paper Developer Question
> >>>
> >>>
> >>>I have few boxes of 25+ year old enlarging paper, including Ilfobrom
> and
> >>>Portriga Rapid. It is unopened, so I decided before blazing away I
> >>>should look for some information about how to best to process it,
> >>>particularly to minimise fog. First I sourced some benzotriazole which
> I
> >>>thought could just be added to Dektol or Neutol or Bromophen developer.
> >>>
> >>>Then following links from the UnblinkingEye website I found some
> >>>suggestions that both amidol-based or glycin-based developers are more
> >>>resistant to fog than the usual MQ or PQ blends. Does anyone know if
> >>>that is right, and whether either of them is likely to be a better
> >>>developer for my old paper?
> >>>
> >>>Thanks
> >>>Don Sweet
> >>>
> >>> The fog in old paper or film comes from a chemical change in the
> >>>emulsion. I think the advice about Glycin or Amidol may come from some
> >>>confusion about the type of fog here. Some developers are less likely
> to
> >>>cause fog themselves than others and don't need as much anti-fog.
> >>>However, this is also dependant on pH. Some low activity film
> >>>developers, like D-76 and D-23 don't produce enough fogging to require
> >>>an antifoggant although fresh D-76 will produce a slight amount of fog.
> >>>Higher pH developers of the sort usually used for print developing
> >>>nearly always need some anti-foggant. This is also because fog is not
> >>>tolerable in prints but can be tollerated in film if not too great.
> >>> Benzotriazole is more effective in reducing fog in old paper than
> >>>bromide although bromide often works. Benzotriazole also tends to
> >>>produce cold images where bromide tends to warm them up. Usually
> >>>benzotriazle will result in less loss of speed.
> >>> Grant Haist has a chart in his book showing approximate amounts of a
> >>>benzotriazole solution to add to developers for different amounts of
> >>>fog. Be aware than if the fog is bad enough no anti-foggant can fix it.
> >>>Also, the antifoggant will affect the paper curve a bit so it won't
> look
> >>>quite the same.
> >>> Plain Dektol or Bromophen or any other standard paper developer
> works
> >>>fine with this stuff.
> >>> Unfortunately, my copy of Haists' book is boxed up at the moment.
> >>>
> >>>---
> >>>Richard Knoppow
> >>>Los Angeles, CA, USA
> >>>dickburk@xxxxxxxxxxxxx
> >>>
> >>>
> >>>
> >>
> >>========================================================================
> ==
> >>===================================
> >>
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> >>>
> >>>
> >>
> >>--
> >>________________________________________________________________
> >> Bogdan Karasek
> >> Montréal, Québec bogdan@xxxxxxxxxxxxxxx
> >> Canada www.bogdanphoto.com
> >>
> >> "I bear witness"
> >>________________________________________________________________
> >>
> >>
> >>========================================================================
> ==
> >>===================================
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> >
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>
> --
> ________________________________________________________________
> Bogdan Karasek
> Montréal, Québec bogdan@xxxxxxxxxxxxxxx
> Canada www.bogdanphoto.com
>
> "I bear witness"
> ________________________________________________________________
>
>
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