Gandolfi;

I have observed the same effect with both my own coatings and with commercial coatings. I have seen that it takes place when I suspect higher silver levels (in my coating) or overexposure / overdevelopment in commercial coatings. You see, even though Dmax terminates somewhere around 2.0 in reflection prints, with more development and / or more silver, there is more (but unseen) silver density there.

My boss always told me that in any developer or bleach, Silver Sulfide forms and it is yellow. If you have way too much development (or silver) you can begin to see this yellow Silver Sulfide. To prove this, I coated a lot of silver halide, and overdeveloped it. Then I bleached it and sure enough there was a faint yellow "image" just as you see.

That is the only explanation that I can offer.

PE