Abstract: The present invention conveniently and practically addresses a significant need. The invention provides pens that are clearly labeled with a phrase to indicate that the pens contain GMP-compliant indelible ink. In one aspect, the invention provides an apparatus for writing, comprising: (i) indelible ink; (ii) a construction suitable for containing the indelible ink; and (iii) a text-based label on an outer surface of the construction, wherein the label comprises a word or phrase intended to validate the apparatus for GMP compliance, FDA compliance, and/or EMEA compliance. In another aspect, a method is disclosed for providing a writing procedure that is GMP-compliant, FDA-compliant, and/or EMEA-compliant. In yet another aspect, the invention describes a method for labeling a pen containing indelible ink.