How to print rich black on a PDF

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i know question has been asked before not figure out solution.

 

i having bumper sticker printed in mass quantities , need urgent help.  sticker black with large white text.  problem started when exported ai file pdf , black came out gray.  exported jpeg , found same grey result.  after searching online found pure black not 100k, , seems mixture of cmyk colors.  adjusted colors make rich black blend , when saved jpeg  black displayed intended.  when exported same ai file pdf black still looks grey.  ideas whats going wrong pdf?  pdf print pure black though doesnt display way on screen?

 

 

 

 

what pdf preset using? smallest file size that.

 

screen shot 2013-07-02 @ 1.05.55 pm.png

if use pdfx or high quality print should good. open .pdf in illustrator comfirm.

 

if open in acrobat, may have turn on overprint preview.

screen shot 2013-07-02 @ 1.08.13 pm.png

 

you can use tools >> output preview confirm have other colors in black areas.



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