[pure-silver] Re: B&W Positive from B&W Negative.

Fomapan R 135-36 ISO 100 $3.49 is a replacement for Agfa Scala an is
available from Freestyle, Los Angeles
Photo Formulary sells a reversal process kit based on Hans F. Dietreich's
formula which appeared in March/ April Darkroom techniques
Jonathan Ayers [mail1@xxxxxxxxxxxxxxxxx]

-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Richard Knoppow
Sent: Tuesday, June 26, 2007 2:53 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [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



============================================================================
=================================
To unsubscribe from this list, go to www.freelists.org and logon to your
account (the same e-mail address and password you set-up when you
subscribed,) and unsubscribe from there.

No virus found in this incoming message.
Checked by AVG Free Edition. 
Version: 7.5.476 / Virus Database: 269.9.9/870 - Release Date: 6/26/2007
10:07 AM
 

No virus found in this outgoing message.
Checked by AVG Free Edition. 
Version: 7.5.476 / Virus Database: 269.9.9/870 - Release Date: 6/26/2007
10:07 AM
 

=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your 
account (the same e-mail address and password you set-up when you subscribed,) 
and unsubscribe from there.

Other related posts: