Film. Made positive and negative images with 100% contrast slide film used for making lecture slides
Film. Made positive and negative images with 100% contrast slide film used for making lecture slides adjusting the exposure to get about half black and half clear, overlapped them, dispaced one a bit, taped them together, and made the print. Left the sprocket holes in to prove it was film. I guess today you would just Photoshop in the sprocket holes. -- source link