Just wanted to add a confirmation to John's observations on ID-11 @ 1:3. We have also found that the grain acutance increases at the greater dilution when compared to straight or 1:1. Our method is: 1 min pre soak in H2O, then 15 min in ID-11 / 1:3 @ 74F (3 1/2 gallon tank) w/ very gentle agitaion for first 30 secs. Then 5 - 10 sec. every 30 - 45 or 60 seconds depending on contrast desired.(posted 8515 days ago)