How do I prepare files for black business cards with a 5th color white?

For black business cards that use white ink as a fifth color, you supply your normal CMYK artwork plus a separate white layer that tells the press exactly where the white should print.

• Set up the color artwork in CMYK as usual.
• Add a separate white layer or mask that marks precisely where the white ink goes.
• Keep the white elements on their own clearly labeled layer so they are not mistaken for color.
• Follow the product template for placement, bleed, and safe zones.