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Lots of Jewish shops sell pens made for the purpose of filling in parts of your tefillin which have lost their blackness.

Do you need to buy a special pen (and if so why) or is it all a con and I can use a sharpie? Is there a difference between the boxes and the retzuos (straps)?

  • I believe the marker needs to be a special one for Tefillin & not any marker, as all items used in Tefillin need to be kosher. The Gemarah leans from a Pasuk in Parshas Bo that everything related to Tefillin needs to be kosher to eat. I wrote as comment however as I don't have the exact Gemarah where this is learned out. – Earl May 5 '17 at 13:45
  • Related: judaism.stackexchange.com/questions/52968/… – ezra May 5 '17 at 15:29

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