With T-max 100 I develop for 22min 68F, agitated 30s then 2 inversions/min.(All times for 500 ml tank) Gives finer grain than 1:50,high resolution,suitable for sunny landcsapes at EI 64 and for portraits(no Mackie lines). Higher acutance than Xtol 1:3 IMO. Acros 18min and Delta 100 20min I found also good, slightly more grain.Care, not possible IMO to make hot TEA completely risk free. My tests with T-max 100 show the 1:100 dilution gives finer grain (similar to D76 1:1) than the 1:50.The pH has been reported to be 1:50-9.07 , 1:100-9.01.As these are similar I cannot explain the finer grain with the 1:100. Any other PC-TEA comments?