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==Stability of latent image== Under normal conditions the latent image, which may be as small as a few atoms of metallic silver on each halide grain, is stable for many months. Subsequent development can then reveal a visible metallic image. A famous instance of latent-image stability are the pictures taken by [[Nils Strindberg]], the photographer in [[S. A. Andrée's Arctic Balloon Expedition of 1897|S. A. Andrée's ill-fated arctic balloon expedition of 1897]]. The pictures of the expedition and of the balloon stranded on the ice were not discovered and developed until some 33 years later.
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