White ink can create some amazing effects when used on specialty substrate. Working with it can be a little tricky the first few times, which is why we've created this handy guide for those enterprising designers who are working in Illustrator or InDesign, and would like to avoid any extra setup charges.
Setting Up An Illustrator or InDesign File For Printing With White Ink
Once you've renamed the white color swatch, create a new swatch and name this "White". You'll want to make sure it's color type is set as "Spot Color" and it's color mode is "CMYK". The color build you choose for this color is mostly personal preference, to make it noticeable, we usually use 100% magenta.
Select the remaining elements at are NOT white. With these elements selected, go to the "Window" menu and open the "Attributes" pane (Ctrl+F11 on PC, Cmd+F11 on Mac). After the "Attributes" pane is open, check the "Overprint Fill" box (Also check "Overprint Stroke" if applicable). This ensures that the CMYK values will print ON TOP of our white ink instead of knocking out the white ink and preventing it from printing at all. To see the Overprint effect, go to the "View" menu and select "Overprint Preview", this will show the elements that are overprint as semi-transparent over the "White" ink in the background.
Save as PDF.