I have read and participated in threads on several APUG regarding PC HD and film speeds/ dilutions etc and am finding some anomalies with my brew compared to the findings of others. With my 1st lot of PC HD (dry chems weighed for me but put into solution by me) I have always used a partial-stand type method (1 min agitation then 10 inversions every 3 mins). I found the best ei was approx minus 2/3 stop for most films. this was a little under what most were experiencing but I was ok with that. I have now realised that my 1st lot was infact too strong. I copied the chart from Sandy King's unblinking eye article and misread it ... I mixed chemicals for a 200ml stock solution into a 150 ml stock solution (DOH!) So this time, I have mixed the chems the same (I didnt find out the mistake until after the mix) but reduced the amounts I am using so instead of 1:1:100, i used 0.75:0.75:100 which would make it the same as if at normal strength (I hope). I have tested some FP4 and Delta 100 - both at manufacturers speed ratings. Now I am back in the darkroom, I have been able to use my RH designs analyser pro in densitometer mode to check densities.. I am now getting a whole stop less of film speed in zone i densities (placing it at 0.10 above FB+F) and the zone viii densities show an increase of development time by about 4 mins to approx 16 mins (placed at 1.15 above FB+F) for condenser enlarging. This has confused me a bit. Although I appreciate that individual methods will always cause differences, my questions are: 1. How does this compare to others results (am using roll film); and 2. what would the effect be if I increase the part b solution to about 0.75:1:100 or more? - is that likely to speed up development or EI? would there be any adverse effects with this (loss of edge effects or increase in grain?) 3. Would I be better using the 1:1:100 dilution that i was used to (this was never properly tested as I was scanning negs at the time) and running the test again? thanks in advance - I'm just trying to save on film use as it looks like my favourite Ilford types wont be around for much longer!