maybe none do this anymore ? its just something to watch out for if you
buy it on the used market ....
i usually use ilford rc if i am using rc, and luckily it doesn't have their name on
the reverse side
( 3a format graflex slr ) ... i cut 8x10 sheets of rc paper in half
and tape them end to end. i took a piece of 35mm film and taped it to the end
as a leader and rolled the paper onto the spool. i usually keep it rolled tight for a few
days before putting it in my the camera ... it works pretty well !
box cameras and coffee developers are great for paper negatives
ps you might get some useful information in the paper negative group here on apug