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How do you make an underbase in Illustrator?

To make an underbase in Adobe® Illustrator, just follow these steps:

  1. Select the whole design and copy it.
  2. Go to the White Base Layer and CMD F (paste to front) the design.
  3. Select the whole design (not including the info and reg marks).
  4. Go to Swatches and apply your white. 

When printing white underbases, printers do not want the white base to show on the print. To make sure that it doesn't happen, the white base needs to be slightly smaller than the design so that the colors can cover the edge of the white base. What you'll need to do is choke the white base. To choke the base, make the stroke not as thick as the strokes on the colors. If the strokes on the colors are one point, try 0.5 for the underbase. To watch the process in action, take a look at this video.

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