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Gabriel Lippmann

Life is short and progress is slow.

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I got quite good results from protein plates.

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This result is due to a phenomenon of interference which occurs within the sensitive layer.

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The problem of direct colour photography has been facing us since the turn of the last century.

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When the shot is afterwards subjected to white light, colour appears because of selective reflection.

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The series of photographic operations, developing, washing, final drying, takes about quarter of an hour.

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Most of these pictures, taken while travelling, were developed on the mantelpiece of a hotel room, which proves that the method is easy enough to carry out.

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The length of exposure (one minute in sunlight) is still too long for the portrait. It was fifteen minutes when I first began my work. Progress may continue.

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During exposure, interference takes place between the incident rays and those reflected by the mirror, with the formation of interference fringes half a wavelength distant from each other.

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The plate at each point only sends back to the eye the simple colour imprinted. The other colours are destroyed by interference. The eye thus perceives at each point the constituent colour of the image.

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