Impossible · ISO 100 B&W negative
Impossible Silver Shade
Silver Shade was the very first film Impossible ever shipped. The team in the old Polaroid factory at Enschede announced on March 22, 2010 that they had reinvented integral instant black-and-white, and packs hit Pioneer subscribers within days. There had been no new Polaroid-compatible instant film in production for two years.
What actually emerged from the early packs was not really black-and-white. It was sepia. The reagent chemistry Polaroid used for the original SX-70 monochromes relied on raw materials that no longer existed in 2010, so Impossible had to build a new emulsion and developer from whatever they could still source. The result was warm-toned, low-contrast, and famously unstable. The Pioneer-batch defect everyone learned to recognize was "killer crystal," an orange bloom that grew across the print if moisture got in.
Impossible iterated. UV+ arrived in early 2011 with a protective layer that improved contrast in outdoor light, with Ilford on the silver halide side. The Cool variant followed in April 2012, pushing tone closer to neutral gray and shortening development from five minutes to about three. By the time Cool packs shipped, you could compare Silver Shade to a fresh pack of original Polaroid 600 B&W and the gap, while still real, was no longer embarrassing.
Shoot it in soft daylight. The film does not like contrast; a strong shadow will block while the highlight side blooms gray. SX-70 packs run slower than 600 packs. Shield the print from light for three minutes on First Flush and UV+. Warm the photo against your body in winter; cold stalls the chemistry.
Format is integral 8-photo packs for SX-70 and Polaroid 600 bodies, sold under the Silver Shade name through 2017 before folding into the Polaroid Originals B&W line.
Reciprocity exponent is 1.0, which Zone Light Meter applies as no correction past one second. Integral instant cameras are not built for long exposures and no published reciprocity data exists, because the use case does not really exist outside modified SLR 680 setups.
How the app handles this stock
- Box speed: ISO 100. Picker exposes pull/push chips so you can shoot it at any speed you want and the meter follows.
- Reciprocity: No reciprocity correction needed; metered time is the shot time.
- Expired film: if you load an old roll, set the expiry year and storage in the app and the ISO scales for you. B&W negative decay rates are baked in.