The standard C41 development time is 3:15 at 100F (38C) However, I develop using a 4 reel hand inversion tank and it takes about 25 seconds to fill or to empty. I am looking to lower the temperature to extend the development time to about 5 minutes to reduce error and inconsistency. Rayco's book in the UK gives a C41 recipe and suggests that 95F (35C) at 5 minutes is an alternative to the official time. Would I be at risk of compromising quality in any way by going at this lower temperature (and also extending subsequent baths at the lower temperature) even if I were to use a branded C41 kit? Has anybody any experience of this?