I have foggy a bulk roll (100') of expired Plus-X Pan . After reading your post, I am wondering what could be the formula for developping this film, using PQ developer + KBr. I wish I could get an answer to it. Thx!
There isn't really an answer, you need to use a clean working developer and do some tests, personally I wouldn't bother as the omages I make are precious to me and can't be retaken (well not identically anyway - unless a studio setup).
Athiril, if you need more exposure to reach b+f+0.1 density, and require less development to get the specified contrast, then you will most definitely lose a fair bit of ISO speed.
That's a big if, especially if you start defining the reduced contrast of fogged film as box speed, which I would not.
If your film at a developing time of A has a dMin of 1.0, and a dMax of 1.3, and with x g/L KBr added a developing time of A has a dMin of 0.2 (where fresh film is say 0.1, so there is still some fog there) and dMax of 1.0, and at A+30% with x g/L KBr added has a dMin of 0.3 and dMax of 1.3, I wouldn't start calling it a speed loss.
Just thought I should post my result.
Think it is still heavily fogged and I thin they photos are over exposed, shot it at 50 ASA.
It was an Orwo NP20 film.
Added 1 ml of a 2% potassium bromide solution. Think I should have tripled that. http://www.flickr.com/photos/1049799...tags/orwonp20/
Added 1 ml of a 2% potassium bromide solution. Think I should have tripled that.
1 ml of Sodium Bromide 2% contains 0.001l * 20 g/l = 0.02 g. With a 250ml batch that's less than 0.1 g/l Bromide. The first minute of film development will put more Bromide into solution than this miniscule amount. You will haver to increase that amount at least ten or twenty fold before you will see a difference.
Originally Posted by Bill Burk
What would be the speed of that same Tri-X developed with some Potassium Bromide in my D-76 1:1?
I'm not going to get 400 no matter what I do.
Not all hope is lost, and Bromide is not automatically evil. If you look at color developers, they contain Bromide and even Iodide, yet reach full emulsion speed. The main question is whether you have enough expired product so you can fine tune your developer.
Trying to be the best of whatever I am, even if what I am is no good.