When you Order Flat Brown Kraft Greeting Cards from Print Magic, you can get the many options to use a White Mask below the CMYK colors to enhance their effect. Since the paper stock is dark, all colors printed on it don’t look as bright as they should. And By Adding a white base helps bring their vibrancy back and helps show crisp and sharp colors. Make sure your Mask file is in a vector form and the exact size as your custom design to avoid any alignment problems while greeting card printing.