White ink is most commonly applied as a base layer on metallic, clear, and kraft stocks. In these applications, white ink is printed first followed by cyan, magenta, yellow, and black inks on top. In these instances, the white ink is used to block out the color of the paper or other substrate providing a white background or base. On clear substrates, white is printed under the entire design except for where the window is indicated, thus providing a way to showcase the product inside of the package. On metallic substrates, white ink is printed to block out the areas of your design that you do not want to appear as metallic.