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Developing issue; perpenticular lines


Quantenhorst

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Need some help figuring out a developing issue. Discovering 2 sometimes 3 faint lines (with a slight bluish tone) perpenticular to film feed direction (medium format), almost invisible to the naked eye on light table. Usually one of them is around image mark 4, but sometimes even not a single one.
Added two samples. The second sample (brightened up in post) shows a section in between two frames with a weird circular shape.
 
Tried out different film, cameras and scanners.
The lab is using a Fuji FP363SC AL processor.

Any ideas?

marks.jpg

marks_2.jpg

Edited by Quantenhorst
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