[pure-silver] Re: B&W Positive from B&W Negative.
----- Original Message ----- From: "Speedy ." <speedgraphic@xxxxxxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, June 26, 2007 1:02 PM
Subject: [pure-silver] B&W Positive from B&W Negative.
This question was posted on another forum I am on and thus far the only contribution has been my speculation on where I would I start if I were to try this. There are many here who are much more knowledgable than I am and since I am somewhat interested in trying this someday I thought I'd ask for your advice.
What are we trying? To create projectable B&W 35mm transparancies made by copying Black and white 35mm negatives in a slide duplicator.
What film would you use? How would you expose and develop it? 

Thanks in advance!
Speedy
I am not quite sure I understand what you want. If you want to make projectable transparencies from existing negattives you can print them onto Kodak Fine Grain Release Positive film, which is still available. This is film with an emulsion similar to fast enlarging paper. Its processed in an ordinary print developer. You can also make transparencies directly in the camera by reversal processing negative film. At one time Kodak had a kit for reversing T-Max but I don't know if its still available. The reversal processs is well known but you have to experiment with the first developer. Another problem is that most 35mm B&W negative films have a pigment in the support which is not removable. This cuts down the brightness of the transparencies. I have some formulas for reversal processing and there are others on the web. The process is not difficult but the first developing step is somewhat critical. I will post more details if you want them. Agfa Scala was a B&W reversal film but its off the market now. 

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx



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