I have shot a roll of Ilford XP2 Super 400, a Black & White film that is developed using C41 color process. The prints came back with what seems a blue-ish tint at the top.
I wonder why that is? It's identical on the 4x6 print and on the scan, but I don't know if the scan was made from the negative or the print (I had it developed at Walgreens). Edit: Confirmed that the blue tint exists on the negative as well.
Maybe it's not even blue and just looks like it, but still, it feels... off. The only filter I use is a Yellow 8, no Polarizer/ND/UV etc.
Is it stray light from the Sun? (Which would have been in my back, high up in a cloudless blue sky at 6:30pm)