Very well presented. In fact better than I have ever seen in any book I have read on the water washing part of film processing. All of us on APUG owe you a debt of gratitude for this comprehensive test. I use the Ilford method but extend it to an initial flush then 5,10,15,20, 15,10 5 so 8 changes in total. I'll now stick with this as my method.

Many thanks

pentaxuser