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Quadricolor
Quadricolor is a lithographic printing process that uses four different printing plates capable of creating an image in natural color. It was most widely used with CYMK colors in offset printing though a number of shifting color variations is possible.

Quatro-Chrome
Quatro-Chrome is a trade name for a type of postcard distributed by the American News Company that was printed in four-color continuous tone lithography. These cards were made in Germany.