The top is the raw emulsion. The next is the doped emulsion, which became more foggy. I have since controlled the fog. #s 3 - 5 are levels of ortho sensitizing dyes and the bottom item is Ilford MGIV at the same exposure level to show relative speed.

These exposures were using a Bausch and Lomb monochromator in a device called a spectrosensitometer. It is used to measure the H&D curve as a function of spectral sensitivity. I have one on loan in my DR right now.