You are looking for 1:2/1:3? Did you check out the massive development chart? If not there, look for an older printed version of Xtol data sheets.(posted 8638 days ago)I liked 1:2, but in rotation I'm limited to 1:1. Minimum was 70-80 ml straight Xtol, so 330 ml for 4 rolls in a 1 liter tank.