How to sample color in a PDF for redaction

I have a PDF that I want to remove page numbers from. I assume I use the redaction tool to get rid of them. I can get rid of the page numbers using the redaction tool but some of the page backgrounds are non white so I have to try to guess the color to select for the "redacted area fill color". There is not an eye dropper color sample tool to let me click within the PDF to sample the color I need. Guessing the color is not fun since it has to look almost exact or the redaction fill looks tacky.
How can I sample a color within a PDF?

If you have acrobat professional, you can use: Advanced > Print Production > Output Preview. Hover over the color, and the palette will display the CMYK values. However, this is is printing production tool, so even if your image or color block is RGB, the colors will displayed in the palette as CMYK.

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