I'm getting a print job done in China. It's white on black on one side of a plastic bag. The other side (front) is white only on the clear plastic.
If outputting as PDF what should I do so the printer doesn't just see a blank page? It's text and a vector logo.
Should I export the whole file as EPS?
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Hi @Jo37525436gw06 , this has come up a number of times. The white ink plate has to be represented by a Spot Ink separation. InDesign treats all Spot color inks as somewhat transparent, which is what would happen on a typical offset press—regular offset printing isn’t really capable of printing opaque white the way a printing process like screen printing can—so an accurate InDesign Overprint/Separation preview is impossible.
If you want a soft proof of an opaque color printing on a black substrate for something like screen printing or flexography, Photoshop would be a better choice because it lets you set ink opacity for a Spot Channel and get a reasonable preview of opaque white on black material.
Here I have a grayscale mode doc with a new Spot Channel set as a white Color, with a Solidity of 60% —InDesign does not have a Solidity setting for its Spot colors:
The printer would output the White Ink channel for the plate:
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