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Kodachrome K40 negative b/w processing


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#1 alexandros petin

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Posted 26 August 2007 - 06:07 AM

Hello!
this is my first post.
i have read almost all posts in the Film Stocks and Processing section but still havent found the info i need
i want to develop k40 as b/w negative. i ve read its possible and in a post here there was someone telling that has a link but lost it ;((
anyone tried that with success?
anyone tha can recommend me anything about the procedure?
i ve done some tests but nothing not even a sign of image
in my tests i used kodak d76 developer and 6-12 minutes developing times.
thank you in advance for the help
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#2 alexandros petin

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Posted 28 August 2007 - 03:43 AM

no replies
does this mean noone has done it?
or is there something wrong woth the question?
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#3 Michael Waite

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Posted 28 August 2007 - 08:48 AM

I don't think many people would have tried this as you are taliking about taking a colour reversal stock & processing it to a B&W negative. The first question I would ask would be "Why would you want to do this? What sort of result are you hoping for?" It might be that there is an easier way to achieve that look.
I have heard of still photographers doing it but i'm not sure what the results were like. I do know that you have to wipe of the remjet (anti halation backing). If you look at apug.org & search kodachrome + B&W you will find some discussion.
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#4 Dominic Case

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Posted 28 August 2007 - 08:52 AM

The question is fair enough. I guess no-one here has done it.

I'm not sure why anyone would want to do it - except to see what happened.

Which is what you have done :unsure:

I don't know a lot about Kodachrome, except that the colour couplers are not in the emulsion but in the developer solution. But if you are just processing for black and white, that should not matter. So long as there is an exposed silver halide image, it should develop to silver in a normal developer such as D76. (And in Kodachrome there are three exposed images!)

Make sure your developer is fresh, and at the right temperature.

A quick google suggests that you will need to expose more, and/or develop longer than normal:
Kodachrome as b/w reversal

A second hit says you can process as negative - use a hi-con developer:
Kodachrome as b/w negative
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#5 alexandros petin

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Posted 28 August 2007 - 01:58 PM

Hello again!
first of all thank you for the replies.

i tried searching the net (kodachrome b/w etc) and i got lost in links about the discontinuation of the film blah blah anyway i followed martins instructions from the metadirectory but instead of using d-19 (high con) developer i used the d76. i thought high con was recommended for better results.so i expected at least some image, not with the optimum results, but alas.noting
so maybe somethings wrong with film.
ot os true that the colour couplers are not in the emulsion so three chemical bath are taking place for the color image to form, but before that it is developed as a b/w negative and i thought the result might be interesting
so all this is based on experiment.
my solution was fresh (i had it mixed the previous night and i worked on recommended 20c temp)
the reason i posted was that the film looked exactly like before the process.(only some burned film hints just next to perf)
anyway i will give another try and post the results
meanwhile any suggestions or other paths to the procudure will help me!

ps ill upload if it gives me any results
alex
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#6 David Venhaus

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Posted 28 August 2007 - 09:31 PM

A couple years ago I developed some old Kodachrome II as black and white negative. The film was about 40 years out of date (exp date 1964). I developed it in full strength Dektol for a couple of minutes, if I remember correctly. The film was heavily base fogged. The only thing bright enough to get enough exposure and keep the development time below the fog level was photographing the sun. The film also retains a green layering as many/most?(at least all the ones I've tried) color reversal films do when developed as black and white negative. I hope this helps some, but I'm not sure how different K2 is from K40. I shot the sun (with star cross filter) with reg. double 8mm and printed onto 16mm 7302 BW print film. Below is a scan of that.
Posted Image

Edited by David A Venhaus, 28 August 2007 - 09:33 PM.

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#7 alexandros petin

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Posted 17 September 2007 - 02:59 PM

Ok heres what Ken Ken Paul Rosenthal has sent me.
i managed some image but only after the process,fix, i bleached the film.
thats because my films are heavilly fogged i think.
anyway the results are uneven so nothing.
but the procedure as K.P.Rosenthal suggests is in the attachment.

Attached Files


Edited by Petin Alexandros, 17 September 2007 - 03:00 PM.

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