One thing about the 4x5 paper. I have found that it is usually of the old variety of Azo...usually around 30+ yrs old. While it still should print quite nicely, I believe it has a different formula from the Azo that is produced today, as it responds differently to toners and developers. I ran a few of the 4x5 sheets through this Dektol as well, and I got a neutral to warm color on the prints, while the current Azo produced a slight blue tone. I have also found that the old Azo goes from neutral to a pinkish/chocolate color in selenium 1:3.