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Non-repro blue pens and pencils are the ONLY tools you should use for writing instructions to your printer on your newsletter flats. He will be able to see them, but the camera won't when negatives or plates are made for the printing press. Non-repro blue pens and pencils can be found in most printing supply or stationery stores. (I prefer the pencils over the pens as sometimes the ink is "blobby" enough to show up on the camera.)