More the latter, IMO. I believe T-MAX developer is Kodak's answer to Ilford's Microphen, and not a very good one. Like Microphen and DD-X, it apparently utilizes Phenedione to gain about 60% more real speed without pushing. That's its claim to fame. However, in my experience, T-MAX developer is grainy and not very smooth in its gradation. That may be why there are no formulas.(posted 8550 days ago)