Sticking my nose where it don't belong -I know nothing about any of this stuff- but I was actually reading some things last night in freepatents
Totally over my head
but here is a page on Silver Iodide in emulsions that I actually bookmarked -flol! Why? haha

If its of no help at all you can e-smack me.

The bright yellow silver iodide grains can selectively reduce scatter of blue light while efficiently scattering green and red light. This can have the effect of increasing the green or red speed of an emulsion while simultaneously reducing unwanted blue light exposure.

That seems related to your last post, at least.