transfer time: DT transfers to "completion" -- if you roll the mat down, count to 3, then pull it back up, you will have a mottle -- not to 'completion.'

Kodak DT paper was two layered. there were two mordants in the paper. it also has a noticeable color cast to it. one reason folks back in the day, used other paper (BW fixed out). Several small labs had internal preferences, but the retouchers weren't happy since those papers didn't respond the same to their magic wands...