B/W film mistakenly developed in C41

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bob cutler - 03 Apr 2007 23:30 GMT

What result would be expected if a roll of asa 400 fujifilm b/w were
developed by mistake in c41 chemistry?

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David Nebenzahl - 04 Apr 2007 00:31 GMT

bob cutler spake thus:

> What result would be expected if a roll of asa 400 fujifilm b/w were
> developed by mistake in c41 chemistry?

I take it that this is *not* chromogenic (C41) B&W film? Just checking.

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Because in its current form, it's not to be taken seriously at all.

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George Mastellone - 04 Apr 2007 00:52 GMT

> What result would be expected if a roll of asa 400 fujifilm b/w were
> developed by mistake in c41 chemistry?

You'll end up with blank film. All chromogenic films use bleach to
turn all the silver into soluble silver salts and which are removed in
the fix. Sometimes they are combined in a bleach-fix, "blix." If you
run an ordinary black and white film through a color process you'll have
a bunch of silver to recover from your fix and not much else. Sorry.

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bob cutler - 04 Apr 2007 13:13 GMT

I found my answer elsewhere. Thanks anyway.

> What result would be expected if a roll of asa 400 fujifilm b/w were
> developed by mistake in c41 chemistry?

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Ken Hart - 04 Apr 2007 19:24 GMT

> What result would be expected if a roll of asa 400 fujifilm b/w were
> developed by mistake in c41 chemistry?

The bleach step will completely wipe the film. Do not get c-41 bleach near
b&w film!
My limited experiments show that the c-41 developer is fairly "weak" for B&W
film. It must be used at 100F and the time for Tri-X is in the 7-10 minute
range, instead of the 3:15 for color film. Contrast is a bit low; #3 or 4
filter instread of #2.
The c-41 fixer is also a bit weak. For color film the fix time is 6:30 at
100F. For complete clearing of B&W film, it's more like ten minutes.

If you absolutely had to develope B&W film in c-41 chems, it will work.

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¡¹¡¸Lonely Boy¡¸¡¹ - 07 Apr 2007 06:39 GMT

You will get a piece of blank film.

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> What result would be expected if a roll of asa 400 fujifilm b/w were
> developed by mistake in c41 chemistry?

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UC - 13 Apr 2007 15:42 GMT

> What result would be expected if a roll of asa 400 fujifilm b/w were
> developed by mistake in c41 chemistry?

You would have almost clear film.

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