Oce Arizona 550 GT User Manual page 166

How to Create White Spot Data in Illustrator
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[120] Select Clipping
Then move the new layer outside of the group it is in to un-link it from the clipping path.
2.
[122] Moved Channel
Once outside the group, make sure path is selected and fill it with your Spot 1 color.
3.
166 Chapter 8 - How to Work With White Ink
[121] Copied Path