to save parts of your films. If you are lucky, all that will happen is that the emulsion surface will become very shiny and smooth, especially around high density areas (where more dye or silver is congregated). This may occur in patches and will result in some noticeable artifacts (flaws) when the film is projected or copied. In worse conditions, more serious damage, called "blocking," may occur. When the film dries out, the gelatin emulsion will adhere via crosslinking to the backing layer of the adjacent wrap of film. This is a very strong adhesion, so strong that the emulstion will tear internally and some of the emulsion will remain adhered to the base where it should be and the rest will adhere to the other layer of film. It may also tear from the film base, so that chunks of emulsion will be removed and stuck to the adjacent film layer. Or the whole film will tear. Any attempt to unwind a blocked film will result in damage to the film. While a blocked film cannot be unwound without damage, it is possible to carry out highly specialized conservation treatments that may enable the film to be unwound. These treatments carry a degree of risk, especially if the film has been wet for any length of time before drying out. The treatments are time- consuming and expensive. Unblocking treatments should be thought of as a last resort for attempting to save films that are very important to you. Post