2-color printing
2-color printing
Out of context: Reply #19
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Print gold first, then black overprint. The illusion of a third colour is based on the fact that, if you get your halftone screen just right, your eye will be met by an area that features gold overprinted with little black dots. The black dots, uniformly dispersed, will have the fefct of darkeing the gold down from the un-blemished areas of gold. At the same time though, the black dots are spread out so are lighter than the solid black zones, giving the appearance of being lighter than black.
Lighter than black would look grey except for the warming effects of the gold around the dots, lending it a brown hue.