[pure-silver] Re: Five year old paper?

  • From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
  • To: <pure-silver@xxxxxxxxxxxxx>
  • Date: Mon, 7 Nov 2005 21:16:05 -0800


----- 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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