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12/9/1903: The Lumieres' Autochrome
The Lumiere's Autochrome process was based upon the colour-mosaic principle. Microscopic potato starch particles dyed red, green or blue were sprinkled across a varnished glass film and then dried. The mosaic effect was then coated with varnish followed by a panchromatic emulsion, and the photographic glass plate was exposed towards the lens. The plate was then developed a second time after the first silver image had been dissolved (the reversal process) leaving a colour transparency.
Although the patent was awarded to the Lumieres on 17th December 1903, it was not until 30th May 1904 that the results of the process were presented to the Academy of Sciences in Paris, and a further four years before the process was launched commercially under the market name of Autochrome. Despite this, it was the first practical single-plate colour process to be available to the public and, in 1909, the Lumieres received the Progress Medal of the Royal Photographic Society for their work in the field of colour photography. [ADD]
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