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Evaporograph and Infra Red Images
The metal handle of a table knife cooled in the refrigerator is placed in contact with the plastic membrane. Image is formed by minute droplets of water condensing on the film in areas that made contact with the cold metal.
This experiment was inspired by the February 1972 Scientific American Amateur Scientist article that describes a simple evaporograph made by Roger Baker. Evaporograph is made by stretching a thin clear plastic film over the top of a dark colored glass half full of water and sealing with a rubber band. Dark print in contact with the film will leave an image as it absorbs infra red heat from an incandescent lamp.
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