Lazy snap out the back door, that very, very barely shows a rainbow . More obvious is the poorly hidden remnants of a smudge line of some sort, from poor processing of the film. The first couple of frames also had similar lines... though they were taken over a year ago.
First time I've used the 120 version of Ilford's XP2 Super. Was confused by the frame numbers. They seem to be marked for 645 usage, rather than the square 6 x 6 format that Kodak films and this camera use.
Zeiss Ikon Super Ikonta IV : f/8 : 1/60" : 75mm : ISO400
Film: Ilford XP2-Super 400 (B&W negative)
[Frame : 04]