Based on the craft tradition in producing paint by mixing one or two pigments with black or white an infinite scale of familiar colours can be created. The familiarity originates from the fact that until the 1960's architectural colours consisted of a handful of inexpensive pigments mostly deriving from the earth: ocre, umber and green earth. Ocre and umber can be bunt to darker and more redish pigments. In 18th century the earth colours were supplemented with prussian blue and from 1809 with crome yellow; the two can be mixed to greens in oil paint. Seldom more than two pigments were mixed.
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