Quote Originally Posted by clay
My guess would be that an N-1 could be achieved at 4 minutes, but I didn't run any times this short.
Without try to be contentious, I've been contemplating the idea that "*No* development should ever take less than five (5) minutes, because it will be uneven."

I've done a few hundred, or so, rolls of C41 color, where the usual color development time is three minutes and fifteen seconds ... and although I've certainly made my share of boneheaded mistakes, I cannot say that "uneven development" was ever a problem. Likewise, in reading "Worlds in a Small Room" by Irving Penn, I've noted that,

"Most of the photographs in this book were taken on Kodak Tri-X film. The only exposure records for which I have an accurate record, the pictures in New Guinea and Morocco, show that Tri-X was exposed at 160 ASA, or at 80 to 125 ASA for very dark skins. Development was usually in UFG, 3 to 5 minutes at 68 degrees F."

- Irving Penn, "Worlds In a Small Room", Notes, page 92.

So, being of a questioning nature - I'm wondering about the the reasoning behind the "No less than five minute rule", propagated by Kodak, Ilford, Agfa ... and just about everyone else - and so readily *broken* by Irving Penn.

I *may* just choose to ignore this rule altogether in the future.