[pure-silver] Re: What is this old film?
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 1 May 2007 18:44:58 -0700
----- Original Message -----
From: "janet ness" <nessj@xxxxxxx>
To: "pure-silver" <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, April 30, 2007 8:48 PM
Subject: [pure-silver] What is this old film?
At a camera sale last weekend I bought a box of 4x5 Kodak
Direct Duplicating SO-015 film. Can I use this film to make
enlarged negatives? Can it be used under a safelight,
although the box says "only in total darkness." Can it be
developed in Dektol? The film is dated Feb. 1975. It may
be useless, but it was cheap.
Janet Ness
The closest film to SO 015 I can find in my archives is
Kodak Professional B/W Duplicating Film 4168. This operates
on the principle I mentioned in my last post. I have data in
a 1984 edition of _Kodak Black-and-White Professional Films_
Publication F-5. 4168 was available in sheet sizes: 4x5,
5x7, 8x10. It was an orthochromatic film which could be
processed under a Wratten Series 1A safelight (dark red).
It has no ISO speed because there is no exposure
standard that fits its unique type. KOdak suggests making
test exposures of about 40 seconds with a light source
producing about 3 footcandles at the exposure plane.
Processing is in DK-50, full strength, for about 7 minutes
at 70F in a large tank or in a tray using Dektol 1:1 for 2
minutes at 70F. A charisteric chart shows the variation in
contrast using DK-50 for times of 5 minutes to 8 minutes.
I can send you a scan of what I have. I _might_ have an
old PDF datasheet somewhere but I don't know for certain. In
any case this might give you some sort of guide about the
film, assuming it is still usable.
I did a Google search but most of the returns were
articles mentioning the use of the film rather than data
about it.
This is a very high resolution, very fine grain, film,
probably similar to microfilm in some ways. It evidently
needs to be fixed quite thoroughly for permanence and should
be toned in a protective toner. The data sheet suggests
Kodak Rapid Selenium Toner at 1:19 but that has proved
ineffective for microfilm. Kodak Brown Toner is a better
protective toner.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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