Can anyone tell me if Permanent marking pens are the same thing as Febrice Pens? I am taking pillowcases for the characters to sign on my cruise on Wonder April 23-27, 2006. I got the pillowcase idea from disboards and read that we should put 'fabric pens' in with the pillowcases for the characters to sign with. I bought some colored permanent markers but am afraid they won't write well on the pillowcases. Does anyone out there know anything about this stuff?