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Quadricolor
Quadricolor is a printing process that uses four different halftone printing plates capable of creating a natural looking image. It was based on tricolor printing in red, yellow, and blue with an extra black.

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.