I have recently been working on two separate files, one in InDesign and one in Illustrator CS3. I used the PDF pre-set of PDF/X-1a:2001 for both files when converting them to a pdf. My InDesign file preserved my one spot color, Pantone 285 C, while my Illustrator file seems to have converted it to CMYK. I am not sure why this happened. My question is: How do I convert a file in Adobe Illustrator CS3 to a pdf without losing my spot colors? & How can I check the pdf file once I create it, that my spot color has been preserved? I have Adobe Acrobat 8 Professional.