Transparency appearing from nowhere...

Question

I have a client supplied Indd file. It's set up and an entirely CMYK document with no transparencies, overprints or anything else, so in the Indd file itself everything is all fine and dandy, but when I export a PDF one element has a transparency applied. For whatever reason, a box with only a black fill 0/0/0/100, acquires an overprint setting that shows in the final print pdf. Opened in Ai/Rip software, overprint is switched on, but not in Indd. What could cause this setting to be applied and, is there a solution?

Attached are screen grabs of the affected piece.

Jae32399264rj4s · Accepted Answer

I did find that un the settings, under appearance of black, Overprint of black swatch at 100% was turned on. Turning it off fixes the problem. Question is, why is it turned on by default?

Willi Adelberger · Answer

Pure Black will always overprint per default. Change the value of black from 100% to 99%.

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