C41 Stop Bath

Kilgallb

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I would like to add the stop bath step into my C41 process as recommended by many on this forum. Is the Kodak indicator stop bath I use for monochrome ok for this or should I use a stop bath specifically made for colour?
 

Rudeofus

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Yes, unlike many other stop bath concentrates, Kodak Indicator Stop Bath is based on Acetic Acid and therefore highly suitable for colour processing.
 

Rudeofus

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Photo Engineer said:
Do NOT use the stop bath if it has been used for B&W film or paper. Use freshly mixed stop bath.
Click to expand...

Any reason for this? I know of nothing that could be present in a stop bath which could significantly impact C-41 process steps after colour development.
 

Photo Engineer

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It would be of harm more to B&W films run through it afterwards, but again there are dyes in the two types of films that might cause problems.

I try to err on the side of caution.

Besides, one poster here about 2 years ago had a problem by doing this and it turned out, after a lot of back and forth, that the use with a bunch of B&W films beforehand was the problem.

So....

PE
 

Sirius Glass

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PE thank you for your comments.
 
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