Color photohistory (II).
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Interestingly, strictly speaking this experiment should never have worked! Maxwell did not know this, but at that time the emulsion in use only responded to light at the blue end of the spectrum.
So how could anything have been recorded on the "red" and "green" slides? It was not until one hundred years later that when the experiment was repeated, it was discovered that the green filter had also passed some blue light, whilst the ribbon's red colors were also reflecting ultra-violet rays, which had been recorded on the red plate.
However, though this (by sheer coincidence) produced the right effect, it does not detract from Maxwell's discovery, for with an appropriate emulsion responding to all colors the method works well.
In 1873 Herman Vogel discovered sensitizing dyes, which was a step forward in the pursuit of full color photography. As a result of his work, "orthochromatic" plates, sensitive to all colors with the exception of red, were produced.
But in 1876, some German photographers using "low tech", could get their first color print as showed just below.
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