How to Convert to Black & White?

I am currently using Adobe Acrobat 9 Standard Edition. I have a .pdf document that contains colored font. I want all the font to be black but nothing is working. I have tried to "print" to Adobe, selecting the Black & White option, but the color will not convert. I do not want to have to save my .pdf as another file, convert, and then re-.pdf it. Is there a way to convert to black and white within Acrobat itself?

Thanks and blessings on you.
This worked for me when the "Convert to Composite gray" did not.
My starting pdf file was cmyk and the type was a 57% black boosted with 60-70% of the other process colors. Converting to composite gray gave me a medium dark gray type, not black; and "convert colors to black" worked for the type but blasted the illustrations.
Acrobat has so many damn settings and options; you suspect there must be one that will do what you want, but trial and erroring it can be a long and frustrating process. Bless you for sharing your expertise.

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http://graphicssoft.about.com/od/pselements/ss/10tipspse7_9.htm
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Joke?
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Thanks, Ken.
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How to Convert to Black & White?

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