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William Hume delivered several lectures to Edinburgh
Photographic Society between 1887 and 1898.
On 5 December 1894, the title of his lecture was:
"Remarks on
Photographic Colour Printing - with Experiments".
The process he described involved creating then
combining the results from three negatives, one for each of the
primary colours. This is a lengthy process, the ratio of the
exposures required for each of the three colours being in proportion
1:60:400.
Or, as Hume explained it: explained:
What
is to be photographed in colour? Is it a strutting peacock with his
tail spread? Is it the maiden of bashful fifteen? Or is it the
widow of fifty?
Let
me tell you that none of the three, especially the two ladies could bloom
for six or seven hours in the sitting required for their portraits.
Gentlemen,
we have here a picture of a stuffed parot, what M Lion Vidal calls a
"poly-chromatic impression."
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