Impossible B&W Film for 600 Round Frame Impossible black & white instant film with a round frame for 600-type Polaroid cameras, the Impossible I-1 camera & the Instant Lab. An alternative to the classic square-frame format made famous by Polaroid. Round frame naturally centers the eye making it great for portrait shots – with a nod to classic vignette photography & early-day portraiture. 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.