C41 Stop Bath

[Kilgallb]

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?

 

[Kevin Caulfield]

Yes, the one you already use is fine.

 

[Rudeofus]

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

 

[Photo Engineer]

Do NOT use the stop bath if it has been used for B&W film or paper. Use freshly mixed stop bath.

PE

 

[Rudeofus]

Do NOT use the stop bath if it has been used for B&W film or paper. Use freshly mixed stop bath.

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]

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]

PE thank you for your comments.