Quote Originally Posted by Michael R 1974 View Post
The main issue I'm stumbling on in these initial thought experiments: Although the Pyro mask would add only "color" density to the highlight silver densities in the original negative, in the end would this additional printing density more than offset the contrast filter effect and actually worsen the entire situation?
It depends on the color of the stain and the sensitivity of the paper. For example, when using Ilford multigrade paper, blue light affects density in shadows more than the highlights. Therefore, a yellow stain in the highlights of your projected negative will not have much effect on the highlights, if that is what you are asking. But if the yellow stain is in the shadow area, it will have considerable effect. If you stain the whole thing yellow that will 'hold back' the shadows. Another, easier, way to do it is to just put a yellow filter in the light source when printing.