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I have submitted a PR to 'pdf-redact-tools' tonight. The new feature removes the yellow printer dots by converting the document to black and white: https://github.com/firstlookmedia/pdf-redact-tools/pull/23

Are you very damn sure that it works and doesn't just convert them into #fefefe dots?

But #fefefe isn't black or white? I presume the commenter specifically didn't say greyscale.

EDIT- checked the source:

It looks like imagemagick's 'threshold' [0] command is being used, so everything is max/min/black/white: