Dan, I had a lot of problems with TMAX-100 highlights burning out. The only developer that works well for me is Xtol. I use it diluted 1:1, and I think the recommended time is about 8 minutes @ 70 degrees. I typically go 30 seconds over the recommended time. There is an excellent download from the Kodak web site that has every possible thing you'd want to know about the stuff. CH(posted 9191 days ago)