No benzotriazole needed
QUOTE=nworth;608993]Superior 4 was DuPont's high speed motion picture film. I shot some of it back in the 1960s. It's pretty good, with reasonably fine grain. But watch out for the contrast and avoid overdevelopment. Test by bracketing exposures around ISO 250. You may need to use benzotriazole in the developer for film this old.[/QUOTE]
Good practice, but after two rolls shot from this batch, I like it as it is. The film base density compares to my other current B&W films and any fog it may have is minimal. At this point I am sure the film was optimally stored and it survived its long hibernation. It reminds me of Kodak Super XX which was and still is my all time favorite. If I can find more I'll still buy it.