Yes it is anti-halation dyes, while I am not up on the school of what's happening now, I have been giving my neg's a 5:00 minute pre-soak for years, and have not had any uneven development since I started. I had a friend of mine who had streaking in his development with 2 minute soaks, he switched to 5 min. and had no more problems. Pat(posted 9063 days ago)