Thanks Nicholas, I would have never thought of that explanation. I'll chalk it up to a learning experience but am confused why my foma 100 doesn't do a similar thing with stand development?
Originally Posted by Nicholas Lindan
That's the real question - some possibilities:
Originally Posted by Erik L
- More developer per unit of film area
- Greater developer depth
- Less temperature difference developer to air
- Less temperature difference bench/sink/tray to developer
- Less bromide in Foma emulsion
- 8x10 Vs 11x14 film size
It may be that the conditions that exhibited the problem were unique with just the right temperature gradients and a second film developed with the same stand regime would not exhibit the same problem.
It is a bit like being hit by lightning while playing golf in a thunderstorm: it is to be expected; but playing golf in a thunderstorm is no guarantee of getting hit. The 'gator skin' effect is to be expected, but there is no guarantee of it happening.
And of course, there is no guarantee of the convection cell theory being correct - the problem could be due to something completely different such as a film manufacturing defect.
Most interesting case of darkroom detective I've read in some time, well done guys.
Nicholas, thanks for thinking this through. I liked your original theory whether it's true or not