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With CS6 or later you can export to grayscale and in that case the crops will be black only. Like this:
You should set your Appearance of Black to Rich black otherwise 100% black CMYK might export to something less than 100% grayscale. When you check the PDF in Acrobat set the simulation profile to the grayscale profile you export to.
Thank you for your response. The document has a combination of B&W pages and color pages so I can't use the greyscale option. I should have been more clear about the makeup of the doc. My apologies for that. The crop marks make every page color when half of them are B&W which is messing up the costing.
Thanks again for the response. I hadn't really looked at the output option when exporting. It actually has some useful stuff in there. Thanks for leading me to it.
I have tried to edit the cropmark script by changing "Registration" to "Black" on the line with myRegColor.
And that does work here, but only for the script, not for the automatic marks you get in the Print or Export dialogs when you select marks.
I have a book that gets revised occasionally that is printed on laser equipment and has this problem. I solved it by adding a slug area and putting my own marks on the master pages. No automatic marks means no unwanted color pages.