Impossible PZ 600 Silver Shade UV+ Black Frame for Polaroid  Spectra/Image/1200 cameras Impossible's PZ Silver Shade is a first-never-before-released black and white film for Polaroid Spectra camera users with a special black matte frame Spectra cameras offer professional-level controls as well as double-exposure capability Spectra cameras are widely available in the US used market and through Impossible. Film Speed: ISO 125 Development: approx 3 minutes at 70F (21C)