Quote Originally Posted by Photo Engineer View Post
The yellow dye in Jim Browning's Matrix Film is not for halation. It is to limit penetration of light into the coating, which is exposed from the base, so that the image is sharp and limited to the base region. As the emulsion hardens in the tanning developer, it then adheres strongly to the base.


PE exposure from the base ,with yellow dye inhibiting exposure further "up" is probably why it works as a matrix film ? With more light ,proportional to the negative density,penetrating further and yeilding higher areas after hardening and clearing.
What about halation ? Should we ignore it, like I have been doing, or might it be an issue for color separation work?
My sugestions about which dyes to try were based on old papers and I do not think that I can out-do you as far as picking dyes is concerned.