Great thread, I'm following this with interest.
I have a bit of a long-winded question based on this point: in the world of B&W, the faster the film, the longer it is developed to realise the speed.
So, to prevent overdevelopment of the slower, top (yellow) layer(s); is any kind of restrainer added to the emulsion for this layer? Or, do the bottom layers contain an enhancer to increase the speed (time) at which they develop? Either option would allow the layers to develop concomitantly to the same degree.
My problem with this is that over time, the concentration of the restrainer/enhancer diffusing out of the emulsion and into the developer would increase, thus altering its performance (compensated for by replenishment, or chemical quenching by another developer additive?)
Or, are the faster, lower layers deliberately under-developed and compensated for in other ways e.g. the chemistry of colour papers and/or the orange film mask?
Or, is it too minor a problem to worry about in a 3:15 dev time and I'm over-thinking it?
Note to self - need a copy of Bob's book...
Last edited by Jim Taylor; 06-29-2013 at 08:10 PM. Click to view previous post history.
Reason: Late at night, bad spelling!!