Easily See “Registration” Color

If you have trouble telling the difference between Black and Registration colors in QuarkXPress, you can change the Registration color to display as any color you’d like. It still prints on every plate; it just looks different on screen. 

The quickest way to edit a color is to Control-click or right-click on the color in the Colors palette, then choose Edit Registration… from the contextual menu that appears. In the resulting color picker, try choosing a bright, unusual color.