Impossible B&W Film for 600 Black Frame Impossible black & white instant square frame film for 600-type Polaroid cameras, the Impossible I-1 camera & the Instant Lab, with black frame. Images emerge in 20 seconds, giving a finished, fully-developed picture in five minutes. The B&W 600 film develops in normal light conditions without the need to shield or protect from sunlight. Tones are accurate, contrast is rich & vivid, with a fresh, clear & sharp final finish.