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The Invention of Photography

In Our Time

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Photochemical Capturing - A History of Chemistry

Photographic plates are far more sensitive at the blue and violet end than they are at the red end. That meant that there was always the possibility of capturing on a photographic plate marks of things we cannot see. Talbot had already anticipated that back in 1844. With long exposures, photographic plates could pick up images too faint for us to see.

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