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Quadricolor
Quadricolor is a variation of the tricolor printing process where black is added to a palette of red, yellow, and blue. These halftone images were capable of reproducing an image in natural color.

Quatro-Chrome
Quatro-Chrome is a trade name for a type of German made postcard distributed by the American News Company that was printed as a black collotype over red, yellow, and blue lithographic tints.


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