Kodachrome K40 negative b/w processing
Posted 26 August 2007 - 06:07 AM
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
Posted 28 August 2007 - 03:43 AM
does this mean noone has done it?
or is there something wrong woth the question?
Posted 28 August 2007 - 08:48 AM
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.
Posted 28 August 2007 - 08:52 AM
I'm not sure why anyone would want to do it - except to see what happened.
Which is what you have done
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
Posted 28 August 2007 - 01:58 PM
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
Posted 28 August 2007 - 09:31 PM
Edited by David A Venhaus, 28 August 2007 - 09:33 PM.
Posted 17 September 2007 - 02:59 PM
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.
Edited by Petin Alexandros, 17 September 2007 - 03:00 PM.