[pure-silver] Re: Five year old paper?
- From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 8 Nov 2005 08:50:14 -0500
> Make a 0.2% solution of
>Benzotriazole by dissolving 2 grams in a liter of water.
>Adding a little Isopropyl alcohol may aid in the solution.
In my experience isopropyl alcohol should not be necessary for making a 0.2%
solution of benzotriazole. I routinely make a 1% solution without difficulty
using warm water.
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Richard Knoppow
Sent: Tuesday, November 08, 2005 12:16 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Five year old paper?
----- Original Message -----
From: "Philippe Gauthier" <pgauth@xxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, November 07, 2005 8:22 PM
Subject: [pure-silver] Re: Five year old paper?
> Richard Knoppow a écrit :
>
>> As far as buying very old paper I would do it only if
>> its _very_ cheap.
>>
>
> I did last year and got relatively lucky. I got a huge
> pile of old paper for the equivalent of two US dollars.
> Most of the stuff was obviously much too old - for
> instance, some 1964 vintage Kodak Panalure, but I was
> lucky enough to find a box of 8x10 Ilford MG IV RC and 5x7
> Ilford MG IV RC cooltone in perfect condition. There was
> also a package of 10 to 15 years old Seagull Oriental that
> turned out to be quite good, but recent looking Kodak
> Polycontrast IV turned out to be severely fogged - I could
> almost use the test strips as grey cards!
>
> Now, if I buy some of this paper and find out that there
> is some minor fog, how much potassium bromide should I add
> to my developer? Can you give me a starting point in grams
> per liter?
>
> PG
>
For Benzotriazole
Make a 0.2% solution of
Benzotriazole by dissolving 2 grams in a liter of water.
Adding a little Isopropyl alcohol may aid in the solution.
Add about 15ml of this solution to a liter of working
strength
developer and test it. If there is still fog keep adding it
in 15 ml
increments until the fog disappears. If you add a lot you
may have to
increase the exposure somewhat.
For Potassium bromide I would test with the equivalent of
about 5 grams per liter in the _stock_ solution. Dektol and
similar developers have around 2 grams per liter as they
come. One can increase the amount in the stock to as much as
20 grams per liter although development time will be slowed.
I give the equivalent for stock since I don't know how much
you dilute.
Benzotriazole will tend to shift the paper color toward
blue, Bromide toward yellow or brown.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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