[Avodah] ksav she'i efshar l'hizdayyef

[David Riceman]

We went off to visit a sofer the other day to chat about getting 
tefillin for my son's forthcoming bar mitzva.  While talking about the 
chemical properties of parchment he mentioned how easy it is to erase 
letters (via razor blade), and I added that that's why one shouldn't 
write a kesuva on parchment (see HM 42:1).  The sofer then told me that 
he had arranged to find parchment for a prominent person's son's 
kesuva.  Neither of us knew an obvious reason to permit it, but we both 
agreed that one might exist.  What could it be?

David Riceman