It's a good idea to show your printing service color separations or a composite of your publication, simply to ensure that your colors look the way you want when they are finally printed.
Before you begin this procedure, make sure you set up your publication for process or spot-color printing. (Tools menu, Commercial Printing Tools, Color Printing.)
All the colors in your publication will print on the same page.
When you print separations, Microsoft Publisher prints one page for each color used in your publication. Separations appear in black and white, even if you print to a color printer, because your printer uses them only to determine how colors are laid out.