| Light
Sensitive Materials (contd.) |
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| • | In 1727, Johann
Heinrich Schulze (1687-1744), a German |
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| scientist found
that silver salts darkened when exposed to |
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| sunlight and
published results that distinguished between the |
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| action of light and heat
upon silver salts. |
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| • | Even after this
discovery, a method was needed to halt the |
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| chemical
reaction so the image wouldn’t darken completely. |
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| A Simplified
Schematic Representation of the Silver Halide Process |