How to indicate a cut out for a product window

I just started learning package design. I have finished my artwork and want to send the final file to the customer.

The design has a product window. How should I indicate this layer in Illustrator? How do I tell the printer they have to cut this shape out?


  • Use a separate layer for the cut out (window) artwork and move this on top of the layer stack.
  • Apply a distinct color swatch to the outline of this window shape and make it a spot color.
  • Select this shape and set it to ‘Overprint Stroke’ in the ‘Attributes’ panel.

Source : Link , Question Author : Keemie , Answer Author : Lucian

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