Converting 4-Color Blacks to 100% Black

Is there a way to convert 4-Color Blacks(Rich Blacks) to 100% Black? For example today I got a file that was CMYK 4 Color however the blacks in the PDF file were not 100% Black is there a way to convert the 4 Color Blacks to 100% black in Acrobat? I don't want the whole PDF to be Greyscale. I still want the color but I want to specifically target the 4 color blacks and turn them to 100% black. Can this be done? I am using Acrobat 8.

It's possible but not easy.
You first need to identify exactly what the "rich black" in the document is - 4-plate CMYK, RGB, etc. then create a Preflight Check that finds only that color combination, with a second item in the check to filter only by text objects.
You can then use it as the trigger item for a Convert Colors preflight fixup, applying something like a dot gain 30, which will blow the rich black out to 100K.

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