Every pack of Polaroid film is stamped with a production date; the date your film was born. This is located on the side of the film box.
For best results when shooting, we recommend using your film within 12 months of this production date.
Quality of the film and storage
Chemical changes occur as film ages. These changes can eventually affect how well the film performs. After 12 months from the date of production, it is unlikely that the film will produce images that meet Polaroid standards of quality.
However, the aging of film depends on a number of factors, including storage, temperature and humidity. Therefore, a film may continue to produce acceptable results for some time after it has officially expired if it has been stored correctly.
Full Article: How to store Polaroid film
Expired materials can also produce interesting results, but we cannot guarantee that they will process at all. The most common effects of aging are a loss in image contrast, color shifts, or an uneven spread of the chemistry over the image area. If you’re a fan of abstract art and post-modernism, you might be pleasantly surprised with what comes out, but if you’re just trying to take a photo of your friends, you might be disappointed with the results.