Autochrome
	• A glass plate was covered with tiny grains of potato starch dyed red-orange, green and violet in a layer only one starch grain thick. • Then a light sensitive emulsion was added. Light struck the emulsion after passing through the colored grains. The emulsion behind each grain was exposed by light from the scene that was the same color as that grain. • The result was a full color transparency.
		Jean-Baptiste Tournassoud, Autochrome, Early 20th century.