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I am working in Illustrator CC with a CMYK file that has lines stroked with black at an opacity of 10%. When I save this image to a .pdf, the strokes turn pure black instead of being transparent. Why is this happening?

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What PDF job options are you using? –  Scott Jan 21 at 16:55
    
I set it up "Press Quality", but I actually figured it out. I had a blending mode that seems to be incompatible with PDFs, so I changed it. –  shawnromano Jan 21 at 17:59
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1 Answer

Spot colors and some blend modes do not appear correct in Apple's Preview application.

This issue has nothing to do with the PDF. It's a problem with Preview.

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That is great to know! Thanks. What do you recommend for previewing PDFs? –  shawnromano Jan 22 at 15:21
    
Acrobat or Reader. –  Scott Jan 22 at 15:23
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