Hopefully a simple question
I am an experienced photographer, practicing for 7 years (im 21) and I need some help. A year or so ago, I spent a day in Chicago shooting pictures all day. I was shooting black and white film from a 35mm Pentax SLR. When I got them developed, the pictures turned out in an almost green toned sepia. Someone was telling me that it is a specific type of film, and another person told me that it was just a mistake in the developing. If someone could get back to me and let me know what is true, it would be greatly appreciated. Thanks