First 13 X 18 negatives: two questions

[paulbarden]

That is most likely from the back of the negative. Likely an indication of insufficient liquid flow at the back of the negative. It should come off in washing. You may want to wash again.

And re-fix it first. (in a tray)

[Joao Avelar]

That is most likely from the back of the negative. Likely an indication of insufficient liquid flow at the back of the negative. It should come off in washing. You may want to wash again.

Thank you. I feared something more complicated..
regards
Joao

[Joao Avelar]

That is most likely from the back of the negative. Likely an indication of insufficient liquid flow at the back of the negative. It should come off in washing. You may want to wash again.

Thank you. I tried to wash those stains, no effect. Do you recommend any special way to wash them ??
I presume that there are chemicals on the non-emulsion side of the film. I am looking to confirm this. If that is true, a more prolonged (and energetic) pre-washing may provide some help. I will try it-
Regards
Joao

[Fred L]

as Paul suggested, refit the film first and that *should* solve the problem.

[Joao Avelar]

Thank you rfesk, Paul and FredL- You were right.
Problem solved, you were right. I developed the negatives in the reel, used a stop bath and proceede to fixer - two in the reel, two in a tray . Staiins persisted in the reel-fixed negatives, but were completely absent in the tray- fixed ones. I will change my darkroomprotocol accordingly.

Now, is it safe to fix the negatives (after the stop bath), under a red light ?? Or should I fix them always in complete darkness ??

Many thanks for your sugestion

Joao