Quote Originally Posted by Rudeofus View Post
Two things: before C41 was invented, other processes were used and these could be run at room temperature. So no, you don't have to run all possible color processes at 38C, but C41 was evidently designed for operation at this temperature and will not work well above or below 38C. It's all how you design the process. Note that such a process consists of emulsion and developer, so there's not much we can do about this.

And second: b&w doesn't have the issue with color balance, so you could, in theory, run a b&w process way beyond 38C. What will prevent you from actually doing this are the resulting extremely short dev times and in some cases considerable softening of the gelatin, but not the process itself.
It sounds as if you are saying that it is "time is money" driven. The C41 process consists of the type of emulsion and developer that has been arrived at and we the users are not in a position to use the "wrong" temp with the existing process but in your opinion Kodak and others could have devised another process that would work at say room temp There is no inherent reason why it has to be 38C. It isn't governed by any absolute laws of chemistry or physics in the way that at sea level the boiling point of water can only be 100C

Have I understood your reasoning correctly?

As far B&W is concerned the limits are much greater than we currently use. We could go to 38C and at these temps the emulsion wouldn't be seriously compromised any more than it is in colour neg development? Presumably if 3 mins 15 secs doesn't create short development problems for colour then it wouldn't for B&W?