Hi there, and thanks for your analysis and suggestions.
I have received a very quick answer to my question from Harman Labs (Ilford) : they were puzzled as you were and made equivalent suggestions. I thank you and Ilford technical support for the thorough answers I've received.
I've taken an FP4 roll (same camera body and lens) and had it processed by a professional : development of the film is perfect : no stains.
So I guess my development process was wrong : though I'm not a chemical expert, I think chemical reasons are why I got thoses black stains on the negative.
The water we have here is hard water (high carbonate content). I prepared my chemicals and got them at 20°c in a water bath, resulting in the solutions being there for quite a while (30 min or more).
In order to exclude the Ilfotec DD-X I changed developer for Isfosol3. I brought demineralized water to 20°c then mixed it with the chemical, stirred it and launched the process as advised by Ilford lab () : the film is perfectly developed!
Have fun in the darkroom!
I have received a very quick answer to my question from Harman Labs (Ilford) : they were puzzled as you were and made equivalent suggestions. I thank you and Ilford technical support for the thorough answers I've received.
I've taken an FP4 roll (same camera body and lens) and had it processed by a professional : development of the film is perfect : no stains.
So I guess my development process was wrong : though I'm not a chemical expert, I think chemical reasons are why I got thoses black stains on the negative.
The water we have here is hard water (high carbonate content). I prepared my chemicals and got them at 20°c in a water bath, resulting in the solutions being there for quite a while (30 min or more).
In order to exclude the Ilfotec DD-X I changed developer for Isfosol3. I brought demineralized water to 20°c then mixed it with the chemical, stirred it and launched the process as advised by Ilford lab () : the film is perfectly developed!
Have fun in the darkroom!
