I'm not sure. I think it may be just the fact that a more energetic developer is usually a higher contrast developer, so the shadows will come in faster than the highlights, and development time for normal contrast will be shorter, giving less time for base fog to appear. It might also just be some other chemical interaction, but I'm not sure offhand what that might be.
Less than enough fixer for complete fixing does
Originally Posted by FirePhoto
leave some silver in the emulsion. Only so much of
a hugh will develop as is silver retained. To warm a
paper in such a manor may be realistic.
A twist on that approach would be toning the residual
silver left in the emulsion. In that way the base paper
could be made any color. Needless to say the image
silver would be affected. Then again any off shelf
warm tone base paper will impart to some
degree a warmth to the image. Dan