J.B.
Hi J. -
I used to work for Archivers and the staff there are educated on everything that has to do with acid-free, lignen-free, etc. As far as pens go . . . I always loved using the slick writer pens. These are the best pens for writing on photo paper as well. The fine tip writer does seem to run out fast (probably b/c of the tip) however, if you aren't writing a ton of recipes all in one day - you should be fine. The medium point works great - almost like a sharpie pen AND it dries instantly (even on photo paper). So, that is the pen I'd highly recommend using. They have several colors but, you can also ask the staff at Archivers (several are located in the TC) what they would recommend too. You'll find everything and anything you possibly need there. Good luck!