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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 '14 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 '14 at 17:59

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 '14 at 15:21
Acrobat or Reader. – Scott Jan 22 '14 at 15:23

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